Question

If one root of the quadratic equation 2x² + ax + 8 = 0 is -2, then 'a' is equal to​

Answer 1

Answer:

2(x)² + a(x) +8=0

2(-2)² + a(-2) +8=0 (-2 is one root)

8+a(-2) +8=0

16+a(-2)=0

a= -16/-2

a= 8

Hence,value of a is 8.