Question

2 ab - 3(B (4α-1) - b (6 - 10α) ) + 7b​

Answer 1

$2ab - 3(b(4a - 1) - b(6 - 10a)) + 7b = 2ab - 3(4ab - b - 6b + 10ab) + 7b = 2ab - 3(14ab - 7b) + 7b = 2ab - 42ab + 21b + 7b = 28b - 40ab$