Evaluating polynomials

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Evaluating polynomials
1. When ${ 4x^2-3 }$ is evaluated for ${x=5,}$ what is the result?
2. Find the value of " ${-x^4-3x^3}$ " when ${x=-3}$
Find the value of the following polynomials, given $a = 2$ $a = 2$ and $b = 5$ $b = 5$ .
1. $\frac{1}{2}a^3-3b$
2. $3ab+5b^2-10a$
3. $a^2b^2-3ab$

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