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Ncert Solutions for Exponents Class 8 CBSE Part 1



In this page we have NCERT book Solutions for Class 8th Maths:Exponents 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/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.


Answer
(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

  4. Answer
  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

Answer

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

Answer
5m   ÷   5-3 = 55
5m × (1/5-3)  = 55
5m+3 =55
So  m+3=5
m=2
Question 6
Evaluate

Answer

Question 7
Simplify.


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