Free previewCourses

Equivalent expressions

Question 1 of 3

Know the idea

Which expression is equivalent to

(x - 1)(x + 1)

Worked example

Multiply each term:

x \cdot x = x^{2}

, the

x

-terms give

-x + (x) = 0x

, and

-1 \cdot (1) = -1

. So the product is

x^{2} - 1

Video walkthrough

Use the existing worked examples and practice while this walkthrough is being prepared.

Which expression is equivalent to

(x + 4)(x + 2)