Question

If a-b=7 ab=9 then a² +b²=

Answer 1

Squaring on both side
So
(A-B)^2=7^2
A^2+B^2-2ab=49
A^2+b^2=49+2*9
A^2+b^2=67




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Answer 2

a-b=7
squaring both the sides
(a-b)^2=7^2
a^2+b^2-2ab=49
putting ab=9 we get,
a^2+b^2-2(9)=49
a^2+b^2-18=49
a^2+b^2=49+18
a^2+b^2=67