Question

Expand the following 1) (2x+3y+4z)2

Answer 1

By using identity (a+b+c)²= a²+b²+c²+2ab+2bc+2ca

(2x+3y+4z)²

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

=4x²+9y²+16z² +12xy + 24yz +16xz

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Answer 2

Answer:

By using the formula (a+b+c)²=a²+b²+c²+2(ab+ac+bc)

Step-by-step explanation:

(2x-3y+4z)²

=(2x)²+(-3y)²+(4z)²+2(2x.(-3y)+2x.4z+(-3y)+4z)

=4x²+6y²+16z²-12xy+8xz+24yz