2x - 9 + 5 y whole square
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use (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
2x=a, -9= b, 5y=c
(2x-9+5y)^2=(2x)^2+(-9)^2+(5y)^2+(2*2x*(-9))+(2*(-9)*5y)+(2*2x*5y)
=》4x^2+81+25y^2-36x-90y+20xy is the answer
2x=a, -9= b, 5y=c
(2x-9+5y)^2=(2x)^2+(-9)^2+(5y)^2+(2*2x*(-9))+(2*(-9)*5y)+(2*2x*5y)
=》4x^2+81+25y^2-36x-90y+20xy is the answer
anandmejaallahabad:
nice answer
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