Question

7 класс, помогите со 2 примером

Answer 1

$1) {x}^{2} + 11x + 28 = {x}^{2} + 7x + 4x + 28 = x(x + 7) + 4(x + 7) = (x + 4)(x + 7) \ 2)3 {x}^{2} + 4x - 4 = 3{x}^{2} - 2x + 6x - 4 = x(3x - 2) + 2(3x - 2) = (x + 2)(3x - 2)$