Advertisements
Advertisements
प्रश्न
a2 – b2 is equal to ______.
पर्याय
(a – b)2
(a – b)(a – b)
(a + b)(a – b)
(a + b)(a + b)
Advertisements
उत्तर
a2 – b2 is equal to (a + b)(a – b).
Explanation:
a. (a – b)2 = a2 – 2ab + b2
b. (a – b)(a – b) = (a – b)2 = a2 – 2ab + b2
c. (a + b)(a – b) = a(a – b) + b(a – b) + b(a – b)
= a2 – ab + ba – b2 ...[∵ ab = ba]
= a2 – b2
d. (a + b)(a + b) = (a + b)2 = a2 + 2ab + b2
APPEARS IN
संबंधित प्रश्न
Expand `("a"-1/"a")^2`
(a – 1)2 = a2 – 1
Evaluate the following, using suitable identity
472
Show that (m – n)2 + (m + n)2 = 2(m2 + n2)
Square of 9x – 7xy is ______.
(a – b)2 + ______ = a2 – b2
(a – b)2 = a2 – b2
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
x2 – 10x + 25
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
4a2 – 4ab + b2
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
`x^2/4 - 2x + 4`
