Question

If 4 is a root of quadratic equation x2 +ax -8 =0, then a = ______



a. -2

b. 2

c. 3

d. -3​

Answer 1

Answer:

Answer is - 2

Step-by-step explanation:

By putting the value of the x as 4

4 square +a(4)-8=0

16+4a-8=0

8+4a=0

8=-4a

a=-2