Let x = log497Thus, its exponential form is⇒ 49x = 7⇒ (72)x = 7⇒ 72x = 7On equating power of the base 7 we get,⇒ 2x = 1Thus, correct answer is (B)

Q8 of 124 Page 42

The value of is

Let x = log₄₉7

Thus, its exponential form is

⇒ 49^x = 7

⇒ (7²)^x = 7

⇒ 7^2x = 7

On equating power of the base 7 we get,

⇒ 2x = 1

Thus, correct answer is (B)

The exponential form of log₂16 = 4 is

The value of is

log₁₀8 + log₁₀5– log₁₀4 =

Questions · 124

2. Scientific notations of real numbers and logarithms

1 1 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 7 7 7 7 8 9 9 9 9 9 9 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 5 6 6 6 6 6 6 6 6 6 6 6 6 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10