Question

simplify the following
$\\ (a - 2b + 5c) (a - b) - (a - b - c)(2a + 3c) + (6a + b)(2c - 3a - 5b)$

Answer 1

- 19a {}^{2} - 34ab - 3b {}^{2} + 16ac + 3c {}^{2}−19a2−34ab−3b2+16ac+3c2 
hope this will help you