SOLUTION: x^2-2x-13=0

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Question 707545: x^2-2x-13=0
Answer by vheroli(126) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2-2x-13=0
a=1
b=-2
c=-13
Using quadratic formula:
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
=
=x+=+%282+%2B-+sqrt%28+4-%28-52%29+%29%29%2F%282%29+
=x+=+%282+%2B-+sqrt%28+4%2B52+%29%29%2F%282%29+
=x+=+%282+%2B-+sqrt%28+56+%29%29%2F%282%29+
Positive square root:
=x+=+%282+%2B+sqrt%28+56+%29%29%2F%282%29+
=x+=+%282+%2B+2sqrt%28+14+%29%29%2F%282%29+
=x+=+%281+%2B+sqrt%28+14+%29%29+

Negative square root:
=x+=+%282+-+sqrt%28+56+%29%29%2F%282%29+
=x+=+%282+-+2sqrt%28+14+%29%29%2F%282%29+
=x+=+%281+-+sqrt%28+14+%29%29+