12. If a + b = 25and a² + b2 = 225, then find ab.
Answers
Answered by
1
a+b)^2 = 25^2
a^2 + b^2 + 2ab = 625
225 + 2ab = 625
2ab = 625 - 225 = 400
ab = 400/2 = 200
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Answered by
1
Answer:
a^2+b^2+2ab=625
2ab=625-225
2ab=400
ab=200
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