Show that (4x+ 7y)2 - 56xy = (4x2) + (7y)2
Answers
Answered by
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
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.
Similar questions