SOLUTION: if the square of a number is added to 8 times the number, the sum is 105.Find the number

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Question 1047634: if the square of a number is added to 8 times the number, the sum is 105.Find the number
Answer by ikleyn(52798) About Me  (Show Source):
You can put this solution on YOUR website!
.
x^2 + 8x = 105,

x^2 + 8x - 105 = 0.

Factor the left side:

(x+15)*(x-7) = 0.

What are the roots?

What is the answer?