Please completely factor this expression.
5c^2 -24cd -5d^2
Thank you!
let's see we need 5*5-1 in the middle
something of form
(5c ) ( 5)
(5c-1) (c +5)NO that gives +24, we want -
(5c+1)(c-5) = 5c^2 -24c -5 progress
so
(5c+d)(c-5d) = 5c^2 -24cd -5d^2
done