Question

If (a-b)square =71 and ab=4.5, find the value of a square + b square and (a+b)square.​

Answer 1

Answer:

(A-B)sq=Asq+Bsq-2AB

Now put value

71=Asa+Bsq-2×4.5

Asq+Bsq=80

(A+B)sq=Asq+Bsq+2AB

NOW PUT VALUE

(A+B)sq=80+2×4.5

=89

Hope it help

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Answer 2

Answer:

71=a²+b²-2×4.5

a²+b²=80

(a+b)²=a²b²+2ab

(a+b)²=80+2×4.5=89