# ML Aggarwal CBSE Solutions Class 7 Math Fourth Chapter Exponents and Powers Exercise 4.2

### ML Aggarwal CBSE Solutions Class 7 Math 4th Chapter Exponents and Powers Exercise 4.2

(1) Using laws of exponents, simplify and write the following in the exponential form:

(i) 27 x 24

(ii) p5 x p3

(iii) (-7)5 x (-7)11

(iv) (3/5)6 (3/5)2

(v) (-6)7 ÷ (-6)3

(vi) 7x x 73

(2) Simplify and write the following in the exponential form:

(i) 53 x 57 x 512

(ii) a5 x a3 x a7

(iii) (712 x 73) ÷ 74

(3) Simplify and write the following in the exponential form:

(i) (22)100

(ii) ((-7)6)5

(iii) (32)5 x (34)7

Solution: (4) Simplify and write in the exponential form:

(i) a3 x a5 / (a3)2

(ii) (23)4 ÷ 25

(iii) [(62)3 ÷ 63] ÷ 65

(5) Simplify and write the exponential form:

(i) 54 x 84

(ii) (-3)6 x (-5)6

(iii) (3/10)5 x (2/15)5

Solution:       (12) Express each of the following as a product of prime factors in the exponential form:

(i) 108 x 192

(ii) 729 x 64

(iv) 384 x 147

Solution: (13) Simplify and write the following in exponential form

(i) 33 x 22 + 22 x 50

(ii) 92 + 112 – 22 x 3 x 170

(14) (i) By what number should we multiply 34 so that the product is 37?

(ii) By what number should we multiply (-6)-1 so that the product is 10-1

Solution: (15) Solution: Updated: December 16, 2019 — 1:57 pm