Math, asked by rudra581, 2 months ago

Show that (4x+ 7y)2 - 56xy = (4x2) + (7y)2

Answers

Answered by shalinisolanki799
1

Answer:

(4x+7y)

2

−(4x−7y)

2

we know (a+b)

2

−(a−b)

2

=4ab

∴(4x+7y)

2

−(4x−7y)

2

=4.4x.7y

=112xy

Step-by-step explanation:

please mark as brainlist

Answered by krishpmlak
0

Answer:

Step-by-step explanation:

L.H.S. = ( 4x + 7y )² - 56xy

= ( 4x )² + ( 7y )² + 2 ( 4x ) ( 7y ) - 56xy

= (4x)² + ( 7y)² + 56xy -- 56xy

= (4x )² + ( 7y )²

= R.H.S .

∴Hence it is proved.

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