Q7 of 90 Page 33

Find the value using the suitable identities.
(98)³

(98)³ = (100 – 2)³

Using Identity:

(x – y)³ = x³ – y³ – 3x²y + 3y²x

(98)³ = 100³ – 2³ – 3(100)²(2) + 3(2)²(100)

= 1000000 – 8 – 60000 + 1200

= 941192

Expand the following cubes:

Find the value using the suitable identities.

(103)³

Find the value using the suitable identities.

(999)³

Questions · 90

3. Polynomials

1 2 3 4 5 6 7 1 1 1 1 2 2 2 2 3 3 3 3 3 3 3 3 4 1 1 1 1 1 2 3 4 1 1 1 1 2 2 2 2 3 4 5 6 6 6 6 7 7 7 7 7 7 1 1 1 1 1 1 2 2 2 3 3 3 4 4 4 4 4 4 5 5 6 6 6 6 7 7 7 8 8 8 8 9 10 10 11 12 12

Find the value using the suitable identities.(98)3