Question

if x=2 is a root of q polynomial f(x) = 2x-3x+7a find the value of a

Answer 1

x=2
f (2)=2×(2)-3 (2)+7a = 0
f (2)=4 - 6 + 7a = 0
= -2 + 7 a = 0
7a = 2
a = 7 ÷ 2
a = 3.5