Factor Quadratic Trinomials with Leading Coefficient 1: example 7.24

Factor: $y^{2} - 6 y + 15$ .

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Factors of 15	Sum of factors
$−1, −15$	$−1 + (−15) = −16$
$−3, −5$	$−3 + (−5) = −8$

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Factor: $m^{2} + 4 m + 18$ .

How did it go?