Answer:
Explanation:
Remark
If the trinomial is going to factor, it must factor as 5 and 1 paired with 3 and 1 as both 5 and 3 do not factor any further. They are prime numbers.
Let's try this:
(5x + 1) ( 1x + 3)
Both factors must contain an + otherwise something in the given equation would be - when the factors are expanded.
It looks like this works. 5 * 3x + 1x = 16x