Answer:
Step-by-step explanation:
Note that √2x = √2*√x, and so we have √2*√x + 13 = √x + 31.
First subtract 13 from both sides, obtaining: √2*√x = √x + 18.
Next, group the √x terms together: √2*√x - √x = 18.
Now solve this for √x. We get:
√x(√2 - 1) = 18, or
18
√x = --------------
(√2 - 1)
To find x, square both sides:
18^2
x = ---------------
(√2 - 1)^2
