Algebra Examples

$x = \sqrt{a^{2} - a - 2}$

Step 1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 2$ and whose sum is $- 1$ .

$- 2, 1$

Step 2

Write the factored form using these integers.

$x = \sqrt{(a - 2) (a + 1)}$