Question

$3c ^{4}-4 {c}^{3} + 7c - 3c ^{4} - 12c ^{3} \ + 7 {c}^{2} =$

Answer 1

3с⁴ - 4с³ + 7с - 3с⁴ - 12с³ + 7с² = (3с⁴ - 3с⁴) + (-4с³ - 12с³) + 7с² + 7с =
= -16с³ + 7с² + 7с