How do I solve this radical equation?

0 ⤊

2 = sqrt(x^2 + 7) - x

Can someone help me with this? The answer is x = 3/4 but I have no idea how to get that.

Thanks!

2007-11-04 14:54:26 · 2 answers · asked by DoWHATiDO 3 in Science & Mathematics ➔ Mathematics

x+2 = sqrt(x^2 + 7)
(x+2)^2 = x^2 + 7
x^2 + 4x + 4 = x^2 + 7
4x = 3
x = 3/4

2007-11-04 15:04:00 · answer #1 · answered by norman 7 · 0⤊ 0⤋

2 = sqrt(x^2 + 7) - x
2 + x = sqrt(x^2 + 7)
(2+ x)^2 = (sqrt(x^2 + 7))^2
4+4x+x^2 = x^2 + 7
4x = 3
x = 3/4

2007-11-04 23:47:31 · answer #2 · answered by james w 5 · 0⤊ 0⤋