Question

Find the value of polynomial $5x-4x^2+3$ at $x=-1$.

Answer 1

Given that: a polynomial as

$P\left(x\right)=5x-4x^2+3$

To find value of polynomail at $x=-1orP(-1)$

So we put $x=-1$ in polynomial,

$P(-1)=5\times (-1)-4\times (-1{)}^2+3$

$P(-1)=-5-4+3$

$P(-1)=-6$

So value of polynomial at $x=-1$ is $-6$.