Question

Разложить на множители.
a(b+c) +4b+4c
3x²-2xy-y²

Answer 1

$a(b + c) + 4b + 4c = a(b + c) + 4(b + c) = \\ = (b + c)(a + 4)$

$3 {x}^{2} - 2xy - y {}^{2} = \\ = x \times 3x + x \times y - y \times 3x - y \times y = \\ = x(3x + y) - y(3x + y) = \\ =(3x + y)(x - y)$