(2x+1)(x-8)
0=2x+1 -> 2 x+1=0 -> x+1=0/2 => x+1=0 therefor x= -1
0=x-8 therefor x=8
if you have a graphing calculator you and place this in they y= part, and the constants are when it hits y=0
if not
1. any time there is a number in front of the x^2 part you will place it in front of the 1st x to give you this
(2x +- ___)(x +- ____)
2. Then you find the factors of the number without an an which is 8.
the factors are 1,2,4, and 8 because all of these numbers can divide into 8.
3. Use trial and error of each
-1 and 8
1 and -8
2 and -4
-2 and 4
until they produce the -15x part some how
4. Lastly set each section in the "()" =0 to find x as shown above
15x2 - 30x -720 = 15(x - 8)(x + 6).
9x squared-15x squared = -6
3x(x^2 - 5)
15x minus 8=minus 180 3x+8=24
x2 - 19x + 60 = x2 - 15x - 4x + 60 = x(x - 15) - 4(x - 15) = (x - 15)(x - 4)
15x2 - 30x -720 = 15(x - 8)(x + 6).
3x
It is: 5x(x-3)
9x squared-15x squared = -6
3x(x^2 - 5)
-15x2+5x=-5x(3x-1)
3x2 + 15x + 6 = 3*(x2 + 5x + 2). There are no further rational factors.
5x(3x + 1)
3(x + 4)(x + 1)
3(2x - 1)(x - 2)
15x minus 8=minus 180 3x+8=24
x2 - 2x - 14 doesn't factor neatly. Applying the quadratic formula, we find two real solutions: 1 plus or minus the square root of 15x = 4.872983346207417x = -2.872983346207417