Question

If (X+a) is a factor of 2x²+2ax+5x+10 find a​

Answer 1

x+a=0

x=-a

2×(-a) ²+2a×-a+5×-a+10=0

2a²-2a²-5a+10=0

-5a+10=0

-5a=-10

a=-10/-5=2