solve using the sqrt property: 2x^2-3=15?

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solve using the sqrt property: 2x^2-3=15?

Please help me, I'm sooo lost.

2007-06-05 13:19:38 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

3 answers

i'm not sure what u want, but simply...:
2*x^2=15+3
2*x^2=18
x^2=18/2
x^2=9
x1=+3 and x2=-3
becouse of the ^2 u have two solutions... both 3 and -3 are solution of th eequation

2007-06-05 13:27:57 · answer #1 · answered by horta792002 3 · 1⤊ 0⤋

2x^2-3=15 ==>
2x^2 = 15+3 ==>
2x^2 = 18 ==>
(divide each side by 2) ==>
x^2 = 9 ==>

x1 = 3
x2 = -3

2007-06-05 15:36:47 · answer #2 · answered by Farid 1 · 0⤊ 0⤋

2 x² = 18
x² = 9
x = ± 3

2007-06-05 22:58:00 · answer #3 · answered by Como 7 · 0⤊ 0⤋