SOLUTION: (x-1)^2=7

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Question 100780: (x-1)^2=7
Answer by chitra(359) About Me  (Show Source):
You can put this solution on YOUR website!
The given expresion is:


+%28x-1%29%5E2=7+

Expanding the left ahnd side we get:

+x%5E2+-+2x+%2B+1+=+7+

x%5E2+-+2x+%2B+1+-+7+=+0+

x%5E2+-+2x+-+6++=+0+


Using the formula we get:

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

here a = 1 b = -2 and c = -6

x+=+%282+%2B-+sqrt%28+4+%2B+24+%29%29%2F%282%29+


+x+=+%282+%2B-+sqrt%2828%29%29%2F%282%29+

Thus the solution