Question

Expand (3a-5b-c)^2 plz help me

Answer 1

= a^2 + b^2 + c^2 + 2ab + 2bc + 2ca
= 9a^2 + 25b^2 + c^2 + ( 2 * 3a * - 5b ) + ( 2* -5b * -c ) + ( 2 * -c* 3a )
= 9a^2 + 25b^2 + c^2 - 30an + 10bc - 6 ca
hope it was helpful