using suitable identity find the solution of this question
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monalisha132:
using (a+b)^2=a^2+b^2+2ab
x^2+9y^2+6xy
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(x+3y)(x+3y)= (x+3y)²
by using (a+b)²= a²+2ab+b²
= x²+2(x)(3y)+(3y)²
=x²+6xy+9y²
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