Question

use suitable identities to find the following product . (3x+4y+7z)²​

Answer 1

Using identity :-

(a+b+c)²= a²+b²+c²+2ab+2bc+2ca

(3x+4y+7z)²

(3x)²+(4y)²+(7z)²+2(3x)(4y)+2(4y)(7z)+2(7z)(3x)

6x²+16y²+49z²+24xy+56yz+42zx

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