Question

Find the value of a if (x + 2) is a factor of 4x4
+ 2x3
– 3x2

+ 8x + 5a

Answer 1

x+2 = 0

x = -2

4*-2*4 + 2*-2*3 - 3*-2*2 + 8*-2 + 5a = 0

-32 -12 + 12 - 16 + 5a = 0

-48 + 5a = 0

5a = 48

a = 48/5

= 9•6 Ans