Ok, so if you are going to solve an equation by factoring, how do you know what signs ( positive or negative) to put in the parentheses?
i.e. x2 + 5x - 6 = 0
(x ? 3) (x ? 2)
2006-11-07 13:30:47 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Since the constant term is negative, the signs must be opposites. A little trial and error shows the answer to
be (x + 6)(x - 1)
2006-11-07 13:41:11 · answer #1 · answered by banjuja58 4 · 1⤊ 0⤋
We know that the only way to get a negative number by multiplication is to multiply a positive and a negative number together, so the -6 at the end was created by multiplying a positive and a negative number, so one sign is positive and one is negative. Then we ask ourselves, what two numbers multiply to make -6 and add to make +5? The answer in this case is +6 and -1, so to factor your equation, we get (x+6)(x-1).
2006-11-07 21:42:45 · answer #2 · answered by Anonymous · 0⤊ 0⤋
x2 + 5x - 6 = 0
x2 + 6x - 1x - 6 = 0
x ( x + 6 ) -1 ( x + 6 ) = 0
( x + 6)( x - 1 ) = 0
x+6 = 0 or x-1 = 0
x= - 6 x = +1
2006-11-07 21:42:32 · answer #3 · answered by Muskaan 1 · 0⤊ 0⤋
x2 +5x-6=0
(x+3)(x+2)=0
x+3=0
x=-3
x+2=0
x=-2
My teacher teach me to do like this .
2006-11-08 02:21:01 · answer #4 · answered by Chong Sian C 3 · 0⤊ 0⤋
(x-3)(x-2)
2006-11-07 21:34:40 · answer #5 · answered by 7 · 0⤊ 2⤋