# Ncert Solutions for Class 8 Maths Chapter 12:Exponents CBSE Part 1

In this page we have NCERT book Solutions for Class 8th Maths Chapter 12:Exponents and Power for EXERCISE 1 . Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
Evaluate
i) 3 -2
ii) (- 4) - 2
iii) (1/2)-5
As we know that
b-n= 1/bn
(i)  3-2  =  1/ 32  =1/9
(ii) (-4)-2   =1/(-4)2= 1/6
(iii) (1/2)-5   =1/ 2-5 =25= 32
Question 2
Simplify and express the result in power notation with positive exponent.

(i)
= (-4)5 / (-4)8
= (-4)5-8
=1/ (-4)3 (ii)

=   1/23x2
=1/26

iv )

=   (3-7/ 3-10) × 3-5
=3-7+10 × 3-5
=33 × 3-5
=3-2
=1/32
v) 2 - 3 × ( - 7) - 3
=   (2× -7)-3
= (-14)-3
=1/ (-14)3
Question 3
Find the value of
1. (30 + 4 - 1) × 22
2. (2 - 1 × 4 - 1)  ÷ 2 - 2

3. (3 - 1 + 4 - 1 + 5 - 1)0

1. (30 + 4 - 1) × 22 = (1+1/4) × 4
= 4+1=5
2. (2 - 1 × 4 - 1)  ÷ 2 - 2
= [(1/2) × (1/4)] ÷ (1/4)
= (1/8)  ×  (4)  =1/2
3.

= 22 + 32  + 42
=4+9+16=29
4. (3 - 1 + 4 - 1 + 5 - 1)0
=1   as  a0=1

Question 4
Evaluate

Question 5
Find the value of m for which 5m   ÷  5-3 = 55