Question

Show using identity,
(4x+7y)²-(4x-7y) ²=112xy​

Answer 1

Answer:

answer is in attachment hope it help

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Answer 2

112xy is equal to 112xy

Step-by-step explanation:

$\ Given \ value:\\\\(4x+7y)^2-(4x-7y)^2= 112xy\\\\\ Solution:\\\\\ formula:\\\\\ (a+b)^2 = a^2+b^2+ 2ab \\\\(a-b)^2 = a^2+b^2-2ab\\\\\ L.H.S \\\\ \rightarrow (4x)^2+(7y)^2+2\cdot 4x \cdot 7y -((4x)^2+(7y)^2-2\cdot 4x \cdot 7y)\\\\\rightarrow (4x)^2+(7y)^2+2\cdot 4x \cdot 7y -(4x)^2-(7y)^2+2\cdot 4x \cdot 7y\\\\\rightarrow 56xy+56xy\\\\\rightarrow 112xy\\\\\ L.H.S = R.H.S$

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