Question

13) Expand (2x - 3y - 4z)^2​

Answer 1

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Answer 2

Answer:

by identity, (a+b+c)²=a²+b²+c²+2(ab+bc+ca)

a= 2x

b= -3y

c= -4z

(2x - 3y - 4z)² = 4x²+9y²+16z²+2[(2x)(-3y)+(-4z)(-3y)+(2x)(-4z)]

= 4x²+9y²+16z²-12xy+24yz-8xz

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