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

1.	Which Identity is use in this (3x+2x-7)^2
Answer» here the IDENTITY (a+b+c)^2=a^2+b^2+c^2+2×(ab+bc+ca) is usedStep-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+49please MARK as BRAINLIEST

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