Advertisements
Advertisements
Question
Simplify:
(7a +5b)2 - (7a - 5b)2
Sum
Advertisements
Solution
(7a + 5b)2 - (7a - 5b)2
= (7a)2 + (5b)2 + 2(7a)(5b) - [(7a)2 + (5b)2 - 2(7a)(5b)]
= 49a2 + 25b2 + 70ab - [49a2 + 25b2 - 70ab]
= 70a + 70ab
= 140ab.
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Simplify the following
`(7.83 + 7.83 - 1.17 xx 1.17)/6.66`
Write in the expanded form:
`(2 + x - 2y)^2`
Simplify (2x + p - c)2 - (2x - p + c)2
If a + b + c = 9 and ab +bc + ca = 26, find the value of a3 + b3+ c3 − 3abc
If \[3x + \frac{2}{x} = 7\] , then \[\left( 9 x^2 - \frac{4}{x^2} \right) =\]
Evalute : `((2x)/7 - (7y)/4)^2`
If a - `1/a`= 8 and a ≠ 0 find :
(i) `a + 1/a (ii) a^2 - 1/a^2`
Simplify:
(2x + y)(4x2 - 2xy + y2)
Factorise the following:
16x2 + 4y2 + 9z2 – 16xy – 12yz + 24xz
Simplify (2x – 5y)3 – (2x + 5y)3.
