Question

If one zero of a quadratic polynomial: $x^2+3x+k$, is $2$, find the value of $k$.

Answer 1

Given that $2$ is a zero of equation $x^2+3x+k=0$, thus will satisfy the equation.

$2^2+3\times 2+k=0$

$\Rightarrow k=-4-6=-10$