# How do you factor #c² - 12cd - 85d²#?

##### 2 Answers

Mar 3, 2018

#### Explanation:

#"using the a-c method"#

#"the factors of - 85 which sum to - 12 are - 17 and + 5"#

#rArrc^2-12cd-85d^2=(c-17d)(c+5d)#

Mar 3, 2018

#### Explanation: