The trinomial expression is .

The trinomial compare to genaral trinomial expression: , So a = 2, b = 13, c = 20.

To find two numbers with a sum of 13 and a product of .

This trinomial list of the factors of 40, and look for the pair of factors is a sum of 13.

The correct factors are 5 and 8.

To factor trinomials of the form , find two integers, m and n, with a sum equal to b and a product equal to c.

Then write  .

                        (Group terms with common factors)

Combine like terms using distributive property: ac + bc = (a + b)c.

Check:

To check the solution by multiply the two factors.

    (Using FOIL method)

Multiply: .

Combine like terms using distributive property: ac + bc = (a + b)c.

                                                (Add: 8 + 5 = 13)

The solution is "true".

The solution is .