Question

factor the trinomial completely.
$x^{2}+2x - 15$
$x^{2}+2x - 15=\square$

Explanation:

Step1: Find pair for sum 2, product -15

We need two numbers that add to $2$ and multiply to $-15$: $5$ and $-3$.

Step2: Write factored binomial form

Substitute the pair into $(x+a)(x+b)$.
<Expression>$(x+5)(x-3)$</Expression>

Answer:

$(x+5)(x-3)$