show that :
(3x+7)²-84x = (3x-7)²
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Show that:
(3x+7)²-84x = (3x-7)²
Solution:
LHS:
(3x+7)²-84x
(3x)²+ (7)²+2((3x)7) - 84x
9x²+ 49+42x-84x
9x²+49-42x
RHS:
(3x)²+ (7)²-2((3x)7)
9x²+ 49-6X(7)
9x²+ 49-42x
LHS=RHS
HENCE SHOWN
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