Question

Which Identity is use in this (3x+2x-7)^2

Answer 1

Answer:

here the identity (a+b+c)^2=a^2+b^2+c^2+2×(ab+bc+ca) is used

Step-by-step explanation:

(3x+2x-7)^2

= 9x^2+4x^2+49+2×(6x^2-14x-21x)

= 9x^2+4x^2+49+12x^2-28x-42x

= 25x^2-70x+49

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