Question

Упростите выражение:(3x+9y)(8x+6)−(6x−4y)(−x−9)

Answer 1

$24x^{2} + 18x + 72xy + 54y - (-6x^{2} - 54x + 4xy + 36y)\\\\24x^{2} + 18x + 72xy + 54y + 6x^{2} + 54x - 4xy - 36y\\\\Otvet : \\30x^{2} + 72x + 68xy + 18y$