2(x-6)+x2
2007-06-20 08:46:57 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
what does x equal?
2007-06-20 09:00:16 · update #1
Completing the square
2(x - 6) + x² = 0
2x - 12 + x² = 0
convert to standard form
x² + 2x - 12 = 0
x² + 2x - 12 + 12 = 0 + 12
x² + 2x = 12
x² + 2x +_____= 12 +_____
x² + 2x + 1 = 12 + 1
(x + 1)(x + 1) = 13
(x + 1)² = 13
(√x + 1)² = ± √13
x + 1 = ± √13
x + 1 - 1 = - 1 ± √13
x = - 1 ± 3.605551275
- - - - - - - - -
Solving for +
x = - 1 + 3.605551275
x = 2.605551275
- - - - - -
Solving for -
x = - 1 - 3.605551275
x = - 4.605551275
- - - - - - - - -s-
2007-06-20 09:59:18 · answer #1 · answered by SAMUEL D 7 · 1⤊ 0⤋
2(x-6)+x2 = 0
2x - 12 + x^2 =0
x^2 + 2x + 1 = 12 + 1
(x+1)(x+1) = 13
(x+1)^2 = 13
sqr [(x+1)^2] = sqr (13)
x+1 = sqr (13)
x= (sqr13) - 1
2007-06-20 16:03:43 · answer #2 · answered by fofo m 3 · 0⤊ 0⤋
You get an expression, x^2 + 2x - 12, which unfortunately doesn't factor easily. That's all you can do, unless it is equal to something. Then you could possibly factor it, or use the quadratic formula.
2007-06-20 15:52:14 · answer #3 · answered by TitoBob 7 · 0⤊ 0⤋
2x - 12 + x^2 = ?
You gotta give us what the equation is equal to if you want to know what x is.
2007-06-20 16:03:12 · answer #4 · answered by Becky M 4 · 0⤊ 0⤋
4x-12
2007-06-20 15:55:10 · answer #5 · answered by Brian K 1 · 0⤊ 0⤋
4x-12
2007-06-20 15:52:34 · answer #6 · answered by Anonymous · 0⤊ 0⤋
equals what?
2007-06-20 15:50:22 · answer #7 · answered by J Scarpacci 2 · 0⤊ 0⤋