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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
Answer
As we know that
b
-n= 1/b
n
(i) 3
-2 = 1/ 3
2 =1/9
(ii) (-4)
-2 =1/(-4)
2= 1/6
(iii) (1/2)
-5 =1/ 2
-5
=2
5= 32
Question 2
Simplify and express the result in power notation with positive exponent.
Answer
(i)
= (-4)
5 / (-4)
8
= (-4)
5-8
=1/ (-4)
3
(ii)
= 1/2
3x2
=1/2
6
iv )
= (3
-7/ 3
-10) × 3
-5
=3
-7+10 × 3
-5
=3
3 × 3
-5
=3
-2
=1/3
2
v) 2
- 3 × ( - 7)
- 3
= (2× -7)
-3
= (-14)
-3
=1/ (-14)
3
Question 3
Find the value of
- (30 + 4 - 1) × 22
- (2 - 1 × 4 - 1) ÷ 2 - 2
- (3 - 1 + 4 - 1 + 5 - 1)0
Answer
- (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.
= 2
2 + 3
2 + 4
2
=4+9+16=29
4. (3
- 1 + 4
- 1 + 5
- 1)
0
=1 as a
0=1
Question 4
Evaluate
Answer
Question 5
Find the value of
m for which 5
m ÷ 5
-3 = 5
5
Answer
5
m ÷ 5
-3 = 5
5
5
m × (1/5
-3) = 5
5
5
m+3 =5
5
So m+3=5
m=2
Question 6
Evaluate
Answer
Question 7
Simplify.
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Class 8 Maths
Class 8 Science
