Answer: C. 25
Step-by-step explanation:
Since, Here given expression,
2√ x + 20 = 15 + 3√ x
⇒2√ x + 20 - 15 = 3√ x (By subtracting 15 on both sides)
⇒2√ x + 5 = 3√ x
⇒ 5 = 3√ x - 2√ x (By subtracting 2 √ x on both sides)
⇒5 = ( 3-2)√ x
⇒√ x = 5
⇒x = 25 (By squaring both sides )
Therefore, Option C is correct.
