How do you factor 27c ^ { 2} - 6a t - r ^ { 2} completely?

2 Answers

The only factored form I see is 3(9c^2-2at)-r^2

Explanation:

Notice that among the terms, the only common factor within any of the terms is a 3 within the 27 and the 6, so we could factor this way:

3(9c^2-2at)-r^2

Jun 27, 2018

Please see the explanation below.

Explanation:

Just in case it was meant to be:

27 c^2 − 6rc − r^2

Then:

Using AC method for factoring the quadratics in the form of:

Ax^2+Bx+C

We need to find two numbers that multiply to -27, and add to -6,

those numbers are -9 and 3 thus:

27c^2-6rc-r^2

=27c^2-9rc+3rc-r^2

=9c(3c-r)+r(3c-r)

=(9c+r)(3c-r)