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2) 5(2x+y-z) = 10x + 5y - 5z
3) 7(p-2q+3r) = 7p - 14q + 21r
4) 4x(x+3y+z) = 4x² + 12xy + 4xz
(x-2)(x+3) ⇒ x²+3x-2x-6 ⇔ x² + x - 6
(x-3)(x+7) ⇒ x²+7x-3x-21 ⇔x² + 4x - 21
(x-5)(x+5) ⇒ x²+5x-5x-25 ⇔ x² - 25