If a -b = 2 and a^2 + b^2 = 20 , find the value of ab.
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Answered by
2
Answer:
the answer is 8 ... oookkk
Answered by
1
Step-by-step explanation:
a-b=2
(a-b)^2=2^2=4
a^2+b^2=20
Using identity (a-b)^2=a^2+b^2-2ab
4=20-2ab
4-20=-2ab
-16/2=-ab
ab=8
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