Question

if x-a is a factor of 2xsquare + 2ax + 5x find 'a'

Answer 1

your answer is
$a = \frac{ - 5}{4}$

Answer 2

f(a)=2a^2+2a×a+5×a
0=2a^2+2a^2+5a
0=4a^2+5a
a(4a+5)=0
a=0 and 4a+5=0
;a=-5/4

;a=0,-5/4