Factor the following:
-80 k^2+144 k-96+120^3
120^3 = 120×120^2:
-80 k^2+144 k-96+120×120^2
-80 k^2+144 k-96+14400 120
120×14400 = 1728000:
-80 k^2+144 k-96+1728000
Grouping like terms, -80 k^2+144 k-96+1728000 = -80 k^2+144 k+(1728000-96):
-80 k^2+144 k+(1728000-96)
1728000-96 = 1727904:
-80 k^2+144 k+1727904
Factor -16 out of -80 k^2+144 k+1727904:
Answer: | -16 (5k^2 - 9k - 107994)
