Show that (3x + 7)(3x+7)–84x = (3x –7 )(3x-7)
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Answered by
3
9x^2 +21x+21x+49-84x = 9x^2-21x-21x+49 ( or 9x^2 -42x -49)
Taking l.h.s :-
9x^2-84x+42x+49 = 9x^2 - 42+49
Lhs and That are equal means , both eq. Are equal
Answered by
13
Answer:
LHS =(3x+7)² −84x
Using , (a+b)²=a² +2ab+b²
=(9x ²+42x+49)−84x
=9x²−42x+49
Using , (a−b)²
=a² −2ab+b²
=(3x)²−2(3x)(7)+(7)²
=(3x−7) ²
= RHS
hence satisfied ✔️
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