Question

Solve to find X. >>> x+2=sqrt(7+2x)

Answer 1

x+2=sqrt(7+2x)
square both sides:
(x + 2)^2 = 7 + 2x
x^2 + 4x + 4 = 7 + 2x
x^2 + 2x - 3 = 0

do you know what to do from here?

Answer 2

ummmm.... not really. could you explain then i could try ..

Answer 3

subtract 2x and -3?

Answer 4

ok, factor that left side of x^2 + 2x - 3 = 0:

Answer 5

(x+3)(x-1)

Answer 6

yes... now the solution is obviously x = -3 or x = 1.
But remember to always check these solutions by sticking your solutions back into the ORIGINAL equation. What's the solution?

Answer 7

okkkk OMG thank youuu soo much.

Answer 8

way to go! you're welcome.