Question

Find the value of x in the equation 2√ x + 20 = 15 + 3√ x .

A. 16
B. 1
C. –5
D. 25

Answer 1

It would be B

It wouldn't be A, C or D because...
16 is a square number and can be simplified to a whole number... 4
-5 cannot be inside a surd and neither can any other negative numbers
25 is a square number and can be simplified to a whole number... 5