Show that: (3x + 7)2 – 84x = (3x – 7)2
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Answer:
LHS =(3x+7)
2
−84x
Using , (a+b)
2
=a
2
+2ab+b
2
=(9x
2
+42x+49)−84x
=9x
2
−42x+49
Using , (a−b)
2
=a
2
−2ab+b
2
=(3x)
2
−2(3x)(7)+(7)
2
=(3x−7)
2
= RHS
Step-by-step explanation:
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