Question

what is the solution to x²+x-90​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:    :. x= 9 , -10

Step-by-step explanation:

x^2 + x -90 = 0  should be the correct equation first of all.

Anyway,

90 = 10 * 9

1= -9+10

Now,    (x^2 -9x) + (10x -90) = 0

            x(x-9) + 10(x-9) =0

            (x-9) (x+10) = 0

            Therefore either x-9 =0 , then x=9

                                     OR

                         x+10= 0 , then x =  -10

           :. x= 9 , -10

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