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Q : 5 Show that

(i) $(3x+7)^2-84x=(3x-7)^2$

Answers (1)

best_answer

L.H.S. = $(3x+7)^2 - 84x = 9x^2 + 42x + 49 - 84x$

$= 9x^2 - 42 x +49$

$= (3x - 7)^2$

= R.H.S.

Hence it is proved

Posted by

Devendra Khairwa

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