Trigonometry Examples

$x^{2} - 2 x - 8$

Step 1

Consider the form $x^{2} + i x + c$ . Find a pair of integers whose product is $c$ and whose sum is $i$ . In this case, whose product is $- 8$ and whose sum is $- 2$ .

$- 4, 2$

Step 2

Write the factored form using these integers.

$(x - 4) (x + 2)$