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Show That (3x + 7)Square2 − 84x = (3x − 7)Square2 - Mathematics

Show that (3x + 7)2 − 84x = (3x − 7)2

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Solution

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

= 9x− 42x + 49

L.H.S = R.H.S

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APPEARS IN

NCERT Class 8 Maths Textbook
Chapter 9 Algebraic Expressions and Identities
Exercise 9.5 | Q 5.1 | Page 151
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