Question

$3(2a - b) {}^{2} - 5(2a - b) - 8$

Answer 1

$\textbf{SOLUTION:}$

$3(4 {a}^{2} + {b}^{2} - 4ab) - 10a + 5b - 8 \\ 12 {a}^{2} + 3 {b}^{2} - 12ab - 10a + 5b - 8 \\ (12 {a}^{2} - 10a) + (3 {b}^{2} + 5b) + ( - 12ab - 8) \\ 2a(6a - 5) + b(3b + 5) + 4(-3ab - 2)$