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Question

Question: The solution set of ƒ′(x) \> g′(x) where ƒ(x) = (1/2) 5<sup>2x + 1</sup> and g(x) = 5<sup>x</sup> + ...

The solution set of ƒ′(x) > g′(x) where ƒ(x) = (1/2) 52x + 1 and g(x) = 5x + 4x loge 5 is –

A

(1, ∞)

B

(0, 1)

C

[0, ∞)

D

(0, ∞)

Answer

(0, ∞)

Explanation

Solution

(12)\left( \frac{1}{2} \right)52x + 1 loge5 × 2 > 5x loge 5 + 4 loge 5

⇒ 52x . 5 > 5x + 4

⇒ 5 . 52x – 5x – 4 > 0

⇒ (5x – 1) (5.5x + 4) > 0 Q 5x > 1

∴ x > 0.