Question

if 4 is a solution of the equation x2+ax-8=0 then a=​

Answer 1

Answer:

(4)(2)+a(4)=8

8+4a=8

a=0/4

a=0

Step-by-step explanation:

4 is the given value of x

put the value of x in the given equation

then simply equate both the sides

and it will be 0/4

which is 0

Answer 2

${x}^{2} + ax - 8 = 0 \\ 4 \: is \: the \: solution \\ {4}^{2} + 4a - 8 = 0 \\ 16 - 8 + 4a = 0 \\ 8 + 4a = 0 \\ 4a = - 8 \\ a = \frac{ - 8}{4} \\ \\ a = - 2$

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