your equation is this... x2 - 100
since you have no x term to the first power you can write 0x... like this
x2 + 0x - 100
Now, what numbers will add to 0 and multiply to -100
The numbers 10 and -10 will
10 + -10 = 0
10 * -10 = -100
therefore
(x - 10)(x + 10) is the way you factor it
(x + 2)(x + 1)
By factoring I get x-3 divided by x+3
xsquared minus x minus 72
17
1
What about it? Factorise it?
x(x - 7)
13X squared + 7X + 12
X2 - 4= (x + 2)(x - 2)===========
( x2 - 121 ) = (x + 11) times (x - 11)
3x2 - 8x = x(3x - 8)
(x - 3)(2x - 7)
5x2 + 9x + 13 has no real factors.
Factorise it: (x + 5)(3x - 8)
X squared + 7X + 12?
It is: x(x-3) factorized
x(x-7)