Question

EXERCISE 4.1
1. Find the cube of the following using identity.
(a) 23
(b) 35
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Answer 1

a) 12167

b) 42875

.................

Answer 2

Step-by-step explanation:

23^2

(20+3)^2

(a+b)^2=a^2+2ab+b^2

(a+b)^2=a^2+2ab+b^2 =20^2+2×20×3+3^2

=400+120+9

=529

35^2

(30+5)^2

(a+b)^2=a^2+2ab+b^2

=30^2+2×30×5+5^2

=900+300+25

=1225

Hope it helps!!!