(less than 0, no roots)

ExampleAlso, how can you determine in an answer in the format of (x + 1)(x - 2) whether it will be a +-, -+, ++, or -- answer?

If the sign after '-7x' isnegative, it means the signs within the two brackets will be different.

ie. (2x+1)(x-4)

If the sign waspositive, it means the signs will be the same for both brackets. This sign used would be the sign after the squared term.

ie.

(2x-3)(6x-1)