What do we know about the factors of c?

Question

In the trinomial 5x²-18x+9, our b value is negative and our c value is positive. What does that tell you about the value of c? Please provide clear explainations

Answer 1

+9 will be equal to the product of 2 negative numbers because negative*negative=positive.

Why negative times negative? A negative plus a negative equals a negative and -18 is negative.

A negative plus a positive may be negative, positive, or zero.