show that (3a- 7b)^2 + 84ab = (3a + 7b)^2
Answers
Answered by
2
Answer:
Solution
verified
Verified by Toppr
(3a−7b−c)
2
A
2
+B
2
+C
2
+2AB+2BC+2CA
⇒9a
2
+49b
2
+c
2
−42ab+14bc−6ac thank you
Answered by
0
Answer:
Step-by-step explanation:
L.H.S. = ( 3a - 7b )² + 84 ab
= ( 3a )² - 2 ( 3a ) ( 7b ) + ( 7b )² + 84ab
= ( 3a )² + ( 7b )² - 42ab + 84ab
= ( 3a )² + ( 7b )² + 42ab
= ( 3a + 7b )²
= R.H.S.
Hence, it is proved
Similar questions