Factor completely.5, x, squared, plus, 9, x, plus, 45x 2 +9x+4

It seems like there might be a bit of confusion in your question as it's not clear which expression you want to factor. Let's break it down:

1. 5x^2 + 9x
2. 45x^2 + 9x + 4

Let's factor each one:

1. 5x^2 + 9x Factor out the greatest common factor (GCF), which is x: x(5x + 9)

2. 45x^2 + 9x + 4 This is a quadratic equation, but it doesn't factor nicely with integer factors. You would need to use the quadratic formula to find the roots if you wanted to factor it. The quadratic formula is (-b ± sqrt(b^2 - 4ac)) / (2a). In this case, a = 45, b = 9, and c = 4.

Please clarify if you meant a different expression.