Question

7. Without actually calculating the cubes, find the value of each of the following:
(i) (23)3 (ii) (102)3 [NCERT, CBSE SP 2013] (iii) (995)
8. If x + = 7, find the value of xº +
[CBSE SP 2011]
1
3
1​

Answer 1

Step-by-step explanation:

(20+3)^3=20^3+3^3+3×20^2×3+3×20×3^2

=8000+9+2400+540

=10949

(100+2)^3=100^3+2^3+3×100^2×2+3×100×2^2

= 1000000+8+60000+1200

=1061208