(x+2y+3z)²expand using identies
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Step-by-step explanation:
We know that (a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)
=x^2+4y^2+9z^2+2(2xy+6yz+3xz)
=x^2+4y^2+9z^2+4xy+12yz+6xz