Question

Multiply: (x + 1)(x - 2).

A. x2 - 2
B. x2 - 2x - 2
C. 2x - 2
D. x2 - x - 2

Can you guide me through it, I would like to know both the answer and how to do it! Thanks

Answer 1

(x + 1)(x - 2)


x*x - 2*x + 1*x - 2*1


x^2 - 2x + x - 2


x^2 - x - 2


So the answer is choice D

Answer 2

The idea here is when you have (a+b)(c+d), you multiply the terms like so


First terms: a*c

Outer terms: a*d

Inner terms: b*c

Last terms: b*d


Then you add them up:

ac+ad+bc+bd

Answer 3

Thanks! :)

Answer 4

you're welcome