Question

4.
(a) 10
(b)-10
(c) 5
If one of the zero of the quadratic polynomial x² +3x + k is 2, then the value of k is
(d) -5gh​

Answer 1

Answer:

-10

Explanation:

$f(x) = x^2+3x+k$

if $\alpha$ is a root of $f(x),$ then $f(\alpha )=0$

$f(2) = 2^2+3X2+k=0 \\=4+6+k=0\\k=-10$