Question

-36с-3(5-6с)^2
Упростите

Answer 1

$- 36c - 3 times (5 - 6c) ^{2} = - 36c - 3 times (25 - 60c + 36 {c}^{2} ) = \ = - 36c - 75 + 180c - 108 {c}^{2} = - 108 {c}^{2} + 144c - 75$

Answer 2

Откуда 60c?

Answer 3

по формуле разности квадрата. (а-b)^2 = а^2-2ab+b^2