Question

2x^2+9x-5=(2x-1)(?)

Answer 1

If you know that (2x - 1) is a factor of 2x^2+9x-5, you can divide 2x^2+9x-5 by (2x-1) and get the other factor.

Otherwise, you can factor by grouping and get the other factor.

To begin that approach, what are two numbers that multiply to -10 and add to +9. ?

@meelimv