Question

If ab=5 and a^2+b^2=9

Find the value of 3(a+b)^2 - 2(a-b)^2

Full answer

Key
^2=square

Answer 1

Answer:

3(a+b)^2 - 2(a-b)^2

=>3(a^2+b^2+2ab) –2(a^2+b^2–2ab)

=>3(9+10) –2(9–10)

=>3(19) –2(–1)

=> 57–(–2)

=>57+2=59

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