SOLUTION: If a-b=4,ab+c^2+4=0, then find a+b.
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Question 1121201: If a-b=4,ab+c^2+4=0, then find a+b.
Answer by Alex.33(110) (Show Source): You can put this solution on YOUR website!
First of all we can easily know a=b+4 <1>. Hence
<2>
Aha! Since
To make <2> valid both expressions must be equal to zero. Therefore
And from <1> we know
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