Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 46)

For the expression 2x² + 7x + 3, what numbers are required to factor by trial and error?

3 and 2

2 and 1

6 and 1

7 and 3

Using the trial and error, the goal is to find two numbers that multiply to get a product of a*c and add up to b (2*3=6 and add up to 7).