SOLUTION: Please help solve: w(w-2)=8

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Question 627059: Please help solve: w(w-2)=8
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
w%28w-2%29=8

w%5E2-2w=8

w%5E2-2w-8=0

Now use the quadratic formula to solve for x

w+=+%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29

w+=+%28-%28-2%29%2B-sqrt%28%28-2%29%5E2-4%281%29%28-8%29%29%29%2F%282%281%29%29

w+=+%282%2B-sqrt%284-%28-32%29%29%29%2F%282%29

w+=+%282%2B-sqrt%2836%29%29%2F2

w+=+%282%2Bsqrt%2836%29%29%2F2 or w+=+%282-sqrt%2836%29%29%2F2

w+=+%282%2B6%29%2F2 or w+=+%282-6%29%2F2

w+=+8%2F2 or w+=+-4%2F2

w+=+4 or w+=+-2

So the solutions are w+=+4 or w+=+-2

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