Math, asked by lakshaysharma4521, 3 months ago

Show that (3x + 7)2 - 84x = (3x - 7)2

Answers

Answered by ItzMeMukku

2

Step-by-step explanation:

L.H.S. =

(i) L.H.S = (3x + 7)2 − 84x =

(3x)2 + 2(3x)(7) + (7)2 − 84x

= 9x2 + 42x + 49 − 84x

= 9x2 − 42x + 49 R.H.S

= (3x − 7)2 = (3x)2 − 2(3x)(7) +(7)2

= 9x2 − 42x + 49

L.H.S = R.H.S

= R.H.S.

Hence it is prooved

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