Advertisements
Advertisements
प्रश्न
Using suitable identities, evaluate the following.
(729)2 – (271)2
Advertisements
उत्तर
We have,
(729)2 – (271)2 = (729 + 271)(729 – 271) ...[Using the identity, a2 – b2 = (a + b)(a – b)]
= 1000 × 458
= 458000
APPEARS IN
संबंधित प्रश्न
Expand: 102 x 98
Using the identity (a + b)(a – b) = a2 – b2, find the following product
(6x + 7y)(6x – 7y)
Factorise the following algebraic expression by using the identity a2 – b2 = (a + b)(a – b)
25a2 – 49b2
Using suitable identities, evaluate the following.
9.8 × 10.2
Using suitable identities, evaluate the following.
(35.4)2 – (14.6)2
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`y^3 - y/9`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/25 - 625`
The radius of a circle is 7ab – 7bc – 14ac. Find the circumference of the circle. `(pi = 22/7)`
Verify the following:
(a2 – b2)(a2 + b2) + (b2 – c2)(b2 + c2) + (c2 – a2) + (c2 + a2) = 0
Find the value of a, if 9a = 762 – 672
