Question

a(2b+5c)-4b(a-3c) если a=-3 b=5 c=-4​

Answer 1

$a(2b + 5c) - 4b(a - 3c) = 2ab + 5ac - 4ab + 12bc = - 2ab + 5ac + 12bc$

$a = - 3, b = 5, c = - 4$

$- 2 \times ( - 3) \times 5 + 5 \times ( - 3) \times ( - 4) + 12 \times 5 \times ( - 4) = 30 + 60 - 240 = - 150$