Advertisements
Advertisements
Question
Using suitable identities, evaluate the following.
9.8 × 10.2
Advertisements
Solution
We have,
9.8 × 10.2 = (10 – 0.2)(10 + 0.2)
= 102 – (0.2)2 ...[Using the identity, (a + b)(a – b) = a2 – b2]
= 100 – 0.04
= 99.96
APPEARS IN
RELATED QUESTIONS
Factorise : 16p4 – 1
(5 + 20)(–20 – 5) = ?
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/9 - y^2/25`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/25 - 625`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
p5 – 16p
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
8a3 – 2a
Factorise the expression and divide them as directed:
(9x2 – 4) ÷ (3x + 2)
Factorise the expression and divide them as directed:
(x4 – 16) ÷ x3 + 2x2 + 4x + 8
Factorise the expression and divide them as directed:
(3x4 – 1875) ÷ (3x2 – 75)
Find the value of a, if pq2a = (4pq + 3q)2 – (4pq – 3q)2
