if sqrt 5 3sqrt x 3 then is equal to, Surds and Indices, General Mathematics

Question:If` sqrt(5) + 3sqrt(x) = 3,` then x is equal to :

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+ AnswerB

+ ExplanationOn squaring both sides, we get :

`5 + sqrt(x) = 9 or 3sqrt(x) = 4`

Cubing both sides, we get 

`x = (4 xx 4 xx 4) = 64`

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Question:If` sqrt(5) + 3sqrt(x) = 3,` then x is equal to :