use ac method
for
y=ax^2+bx+c
mulitply ac ad find what 2 numbers multiply to get ac and add to get b
so
2k^2-13k-24
a=2
b=-13
c=-24
ac=2*-24=-48
what 2 numbers add to -13 and multiply to get -48?
-16 and 3
split middle up
2k^2-16k+3k-24
gropu
(2k^2-16k)+(3k-24)
undistribute
2k(k-8)+3(k-8)
undistribute
(2k+3)(k-8)
