Basic Math Examples

$r^{2} + 7 r - 18$

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 $- 18$ and whose sum is $7$ .

$- 2, 9$

Step 2

Write the factored form using these integers.

$(r - 2) (r + 9)$