WRITE IN TERMS OF 'X'
Given log₁₀ x = 2 a and log₁₀ y = b
i) write 10ᵃ in terms of x
Ans.) log₁₀ x = 2a
=> 10²ᵃ = x, and
log₁₀ y = b
=> 10ᵇ = y
Now, 10ᵃ = (10²ᵃ)⅟² = x⅟² = √x (Ans.)
ii) write 10²ᵇ⁺³ in terms of y
Ans.) log₁₀ x = 2a
=> 10²ᵃ = x, and
log₁₀ y = b
=> 10ᵇ = y
Now, 10²ᵇ⁺³ = 10²ᵇ . 10³ = (10ᵇ)² . 10³ = 1000 y² (Ans.)
iii) If log₁₀ P = 2 a – b, express P in terms x & y
Ans.) log₁₀ x = 2a
=> 10²ᵃ = x , and
log₁₀ y = b
=> 10ᵇ = y
log₁₀ P = 2a – b
=> 10²ᵃˉᵇ = P
=> P = 10²ᵃ . 10ˉᵇ
10²ᵃ x
=> P = -------- = -------- (Ans.)
10ᵇ y