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What is ab in a^2+b^2=4 and (a-b)^2=2
asked
Aug 16, 2017
in
Algebra
by
Grace
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1 Answer
Hello!
You can get ab using this method:
1. You need to expand 2nd equation :
(a-b)^2=2
a^2-2ab+b^2=2
a^2+b^2-2ab=2
2. put together 1 and 3 equation
a^2+b^2-2ab=2
4-2ab=2
4-2=2ab
2ab=2
ab=2/2=1
answered
Aug 16, 2017
by
quickwriter
(
2,510
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