11.

 

2x^2+x-10

When we multiply the first and last coefficients, we get -20. So

we need to survey all possible ways to multiply up numbers to get

20 to find a pair that has a difference of 1.

 

Factors of 20

 

We find that 5 and 4 satisfy our conditions. This allows us to

recover the FOIL step.

 

2x^2-4x+5x-10

 

This comes from

(2x+5)(x-2)

 

Return to test