Question

factor 10+d-2d^2

Answer 1

\[10-4d+5d-2d^2\]
\[2(5-2d)+d(5-2d)\]
\[(5-2d)(5+d)\]

Answer 2

This is just the reverse of the FOIL method.

Answer 3

what about 3b^2-5bc-12c^2 ?

Answer 4

\[3b^2-9bc+4bc-12c^2= 3b(b-3c)+4c(b-3c)\]
\[=(b-3c)(3b+4c)\]

Answer 5

and a^3-2a^2+4a-8