SOLUTION: If the square of a number is added to three time a number the result is 108. Find the number?

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Question 896702: If the square of a number is added to three time a number the result is 108. Find the number?
Answer by thesvw(77) About Me  (Show Source):
You can put this solution on YOUR website!
If that number is x...
x%5E2+%2B+3x+=+108
x%5E2+%2B+3x+-+108+=+0
x+=+%28-3+%2B-+sqrt%289+%2B+4%2A108%29%29%2F2
x+=+%28-3+%2B-+21%29%2F2
x+=+9 or x+=+-12
I used the formula x+=+%28-b+%2B-+sqrt%28b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+