How do you factor the trinomial c² -2cd -8d²?

2 Answers
May 19, 2018

(c-4d)(c+2d)

Explanation:

"the factors of - 8 which sum to - 2 are - 4 and + 2"

rArrc^2-2cd-8d^2=(c-4d)(c+2d)

May 19, 2018

(c+2d)(c-4d)

Explanation:

c^2-2cd-8d^2

find two numbers that their product is -8 and their sum is -2

which they are -4 and +2

now because of c and d they both are squared

(c+2d)(c-4d)

to check your solution try to multiply them if your answer is correct you will get the original equation back

c^2-4cd+2cd-8d^2

c^2-2cd-8d^2