Answer
$x^{2}$ + x - 2
Work Step by Step
Two binomials can be quickly multiplied by using the FOIL method, in which F represents the product of the first terms in each binomial, O represents the product of the outside terms, I represents the product of the two inside terms, and L represents the product of the last,
(x-1)(x+2)
F = x.x = $x^{2}$
O = x.2 = 2x
I = -1.x = -x
L = -1.2 = -2
(x-1)(x+2) = $x^{2}$ + 2x - x - 2
combine like terms
$x^{2}$ + x - 2
