Question

Multiply: (x + 1)(x - 2).
A. x2 - 2
B. x2 - 2x - 2
C. 2x - 2
D. x2 - x - 2

Answer 1

You would use FOIL, which stands for first, outer inner, last. your answer would be x^2-x-2

Answer 2

(a+b)(c+d) = ac + ad + bc + bd
then simplify.
x^2 -2x + x - 2 = x^2-x-2 (D)