Q73 of 111 Page 337

Find the value of n, where n is an integer and

………………….

According to law of indices:

a^m × b^m = (ab)^m

Now comparing on both sides

2^n-5 = 2^-5

n-5 = -5

n = 0

6^2n-4 = 6^-4

2n-4 = -4

2n = -4 + 4

2n = 0

n = 0

Find the reciprocal of the rational number

Find the value of:

(a) 7⁰

(b) 7⁷ ÷ 7⁷

(d) (2⁰ + 3⁰ + 4⁰) (4⁰ – 3⁰ – 2⁰)

(e) 2 × 3 × 4 ÷ 2⁰ × 3⁰ × 4⁰

(f) (8⁰ – 2⁰) × (8⁰ + 2⁰)

Express the following in usual form:

(a) 8.01 × 10⁷

(b) 1.75 × 10^–3

Find the value of

(a) 2⁵

(b) (-3⁵)