Question

if 4 is the root of quadratic equation x2 +ax -8 = 0 then a =

Answer 1

Answer:

Step-by-step explanation:

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

Answer 2

Answer:

${x}^{2} + ax - 8 = 0$

Putting 4 in the place of x , as 4 is the root of this equation..so,

${4}^{2} + 4a - 8 = 0 \\ 16 + 4a - 8 = 0 \\ 8 + 4a = 0 \\ 4a = - 8 \\ a = \frac{ - 8}{4} = - 2$

So, value of a is -2.

Step-by-step explanation:

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