answers:
-9
3 or -6
-3 or 6
3 or 6
2007-02-11 16:34:56 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
-9+x=-18/x
multipy both side by x
-9x+x^2 = -18
bring -18 over to other side
x^2-9x+18 = 0
factor
(x-6)(x-3)
solutions are 3 or 6
2007-02-11 16:39:40 · answer #1 · answered by radne0 5 · 1⤊ 0⤋
Q : -9 + x = -18 / x
x (-9 + x ) = -18
so;
x^2 -9x + 18 = 0
factor the equation..
(x - 6)(x - 3)= 0
so;
x = 6 or x = 3........ans
check factor;
(x - 6)(x - 3)= x^2 -9x + 18
x^2 -3x -6x +18 = x^2 -9x + 18
x^2 -9x + 18 = x^2 -9x + 18 ...both side is same so factor is right....
check equation;
x^2 -9x + 18 = 0
substitute valeu of x = 3 into equation;
x^2 -9x + 18 = 0
(3)^2 -9(3) + 18 = 0
9-27 +18 =0
0=0 both side is same so value is right....
substitute valeu of x = 6 into equation;
x^2 -9x + 18 = 0
(6)^2 -9(6) + 18 = 0
36 - 54 +18 = 0
0=0 both side is same so value is right....
2007-02-11 16:52:58 · answer #2 · answered by Sir Jas 2 · 0⤊ 0⤋
-3 or 6
2007-02-11 16:37:51 · answer #3 · answered by bbal40 3 · 0⤊ 1⤋
-9x + x^2 = -18
x^2 - 9x + 18 = 0
(x - 6) (x - 3) = 0
x - 6 = 0 or x - 3 = 0
x = 6 or x = 3
2007-02-11 16:41:21 · answer #4 · answered by siran357 1 · 1⤊ 0⤋
x + 18/x - 9 = 0
x^2 + 18 - 9x = 0
x^2 - 9x + 18 = 0
(x-6)(x-3)=0
x = 6
x = 3
2007-02-11 16:38:32 · answer #5 · answered by ecolink 7 · 1⤊ 0⤋
-9+x=-18/x
-9x+x^2=-18
x^2-9x+18=0
(x-3)(x-6)=0
x= 3 or 6
2007-02-11 16:44:54 · answer #6 · answered by Anonymous · 0⤊ 0⤋
sry this is america, where english is main language. ONly language i speak.
2007-02-11 16:37:34 · answer #7 · answered by Produh G 4 · 0⤊ 0⤋