Recent questions tagged polynomials

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Let $\mathbb{F}_{q}$ be the finite field with $q$ elements and $P \in \mathbb{F}_{q}[x]$ be a monic irreducible polynomial of even degree $2 d$. Then show that $P$, when ...
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215
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Consider the following polynomial of positive degree $n$\[P_{n}(x)=1+2 x+3 x^{2}+\ldots+(n+1) x^{n}.\]Show that there is no real number $r$ such that $P_{n}(r)=0$ when $n...
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158
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Define a set $S$ of real polynomials as follows:\[S=\{p \in \mathbb{R}[x] \mid p \text { is not constant, }|p(0)|<1\}\]For $p$ in $S$, define\[U_{p}=\{x \in \mathbb{R}| |...
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123
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The number of real cubic polynomials of the form $x^{3}+a x+b$, each of whose complex roots lies on the unit circle $S^{1}=\{z \in \mathbb{C} \mid z \bar{z}=1\}$, equals$...
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183
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There exists a linear polynomial $p(x) \in \mathbb{R}[x]$, for which there exist exactly two subsets $S \subset \mathbb{R}$ such that $p(S)=S$ and such that $\# S=2$.
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133
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Let $p(x)=(x-1)(x-2) \cdots(x-n+1)(x-n)-1$ be a polynomial where $n \geq 1$. Suppose $p(x)=f(x) g(x)$ where $f$ and $g$ are both polynomials with integer coefficients.Sho...
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336
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Consider the set of all possible polynomials$x^3 + a_2x^2 + a_1x + a_0$,with $a_0,a_1,a_2$ integers and |$a_0$| ∈ {0,...,9}, such that for each polynomial, all of its roo...
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211
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If $\alpha, \beta, \gamma$ are roots of $x^3 + ax + 1 = 0$, then$ \frac{\alpha }{\beta }+\frac{\beta }{\alpha }+\frac{\beta }{\gamma }+\frac{\gamma }{\beta }+\frac{\alpha...
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Consider the equation $x^{7} + 4x^5 + 2x^3 + x + 1 = 0.$ The number of real roots of this equation is:(A) 1 (B) 3 (C) 5 (D) 7
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Does there exist a polynomial $q(x)$ with integer coefficients such that $q(1)=2$ and $q(3)=5$ ? Given an example if there is one. Justify, if there is not.
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148
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Let $x$ be a variable that takes real values, and let $f(x), g(x), h(x)$ be three polynomials with real-valued coefficients. Further, let $f(x)$ be a polynomial of degree...
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149
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Let $A(X), B(X)$ be non-zero polynomials in $\mathbb{C}[X]$ such that $0 \leq \operatorname{deg} A \leq \operatorname{deg} B-2$ and $A(X)$ and $B(X)$ do not share any roo...
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156
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Let $f(z)=z^{7}-4 z^{3}-11$. Pick the correct statement(s) from below.$f(z)$ has at least 1 zero in the open set $\{|z|>2\}$.$f(z)$ has at least 5 zeroes in the annular r...
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240
240 views
The number of real roots of the polynomial $x^{3}-2 x+7$ is$0$$1$$2$$3$ 
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185
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For a polynomial of the form $a_{0}+a_{1} x+\cdots+a_{m} x^{m}$ having degree $m>1$, it is known that the coefficients satisfy the relation $\frac{a_{i-1}}{a_{i-1}+a_{i}}...
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144
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Let $f(x)=a_{0}+a_{1} x+\cdots+a_{2 m} x^{2 m}$ be a polynomial, with $a_{0}=$ $a_{2 m}=1$. If each root of $f(x)$ is complex and has multiplicity $m$, show that $a_{m}$ ...
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201
201 views
Let $n \geq 2$. Suppose $\alpha_1, \alpha_2, \cdots, \alpha_n$ are real numbers such that $\alpha_1<\alpha_2<\cdots<\alpha_n$. Let$$P(x)=\left(x-\alpha_1\right)^2\left(x-...
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Let $p(x)$ be a polynomial in $x$ of degree $k \geq 0$. For $n=1,2, \ldots$, define $a_{n}=p(n+1)-p(n)$. If $\left\{a_{n}\right\}_{n=1}^{\infty}$ is in AP, then we must h...
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The polynomial \( x^4 - ax^3 + bx^2 - cx + 4 \) when divided by \( x - 2 \) leaves a remainder of 5 and when divided by \( x + 2 \) leaves a remainder of 11. Then \( b^2 ...
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364
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Let $n$ be a positive integer, and let\[S=\{g \in \mathbb{R}[x] \mid g \text { is a polynomial of degree at most } n\}.\]For $g \in S$, let $A_{g}=\left\{x \in \mathbb{R}...
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246
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For a polynomial $f(x, y) \in \mathbb{R}[x, y]$, let $X_{f}=\left\{(a, b) \in \mathbb{R}^{2} \mid f(a, b)=1\right\} \subset \mathbb{R}^{2}$. Which of the following statem...
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411
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Let $\mathbb{C}$ denote the set of complex numbers and let $k$ be a positive integer. Given a non-zero univariate polynomial $f(x)$ with coefficients in $\mathbb{C}$ and ...
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560
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Let $p(x)$ be a polynomial with real coefficients which satisfies $p(r)=p(-r)$ for every real number $r$. Let $n \geq 5$ be a positive integer. Suppose that $p(i)=i$ for ...
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406
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Consider the following sequence of polynomials with real coefficients.\[\begin{aligned}P_{0}(x) & =1 \\P_{1}(x) & =2 x \\P_{n+1}(x) & =2 x P_{n}(x)-P_{n-1}(x), \text { fo...
1 1 vote
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Let $n \geq 100$ be a positive integer. Let $X_{1}, X_{2}, \ldots, X_{n}$ be independent random variables, each taking values in the set $\{0,1\}$ such that $\operatornam...
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518
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Match List I with List IIList IList IIA. Parallel FFTI. $\theta\left(n^{2}\right)$B. Iterative FFTII. $\theta(n)$C. Evaluation of polynomial at n points by Horner metho...
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Answer whether the following statements are True or False.Given any monic polynomial $f(x) \in \mathbb{R}[x]$ of degree $n,$ there exists a matrix $A \in \mathrm{M}_{n}(\...
2 2 votes
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387
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Answer whether the following statements are True or False.Let $f \in \mathbb{C}\left[z_{1}, \ldots, z_{n}\right]$ be a nonzero polynomial $(n \geq 1),$ and let\[X=\left\{...
2 2 votes
1 answers 1 answer
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Let $$\begin{align} & A=\left\{(\alpha, \beta) \in \mathbb{Z}^{2} \mid \text { the roots } r_{1}, r_{2}, r_{3}\right. \text { of the polynomial } \\ & \qquad \left.p(x)=x...
1 1 vote
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482
482 views
Answer whether the following statements are True or False.Let $f_{1}, f_{2}, f_{3}, f_{4} \in \mathbb{R}[x]$ be monic polynomials each of degree exactly two. Then there e...