Advertisements
Advertisements
Question
Expand (7m − 4)2
Sum
Advertisements
Solution
It is known that (a + b)2 = a2 + 2ab + b2 and (a − b)2 = a2 − 2ab + b2.
(7m − 4)2
= (7m)2 − 2 × (7m) × (4) + (4)2
= 49m2 − 56m + 16
shaalaa.com
Is there an error in this question or solution?
RELATED QUESTIONS
Expand: (98)2
Show that (m – n)2 + (m + n)2 = 2(m2 + n2)
Factorise the following using suitable identity
x2 – 8x + 16
(a – b) ______ = a2 – 2ab + b2
Factorised form of 4y2 – 12y + 9 is ______.
1032 – 1022 = ______ × (103 – 102) = ______.
Using suitable identities, evaluate the following.
(9.9)2
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
y2 – 14y + 49
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
4y2 – 12y + 9
Verify the following:
(a – b)(a – b)(a – b) = a3 – 3a2b + 3ab2 – b3
