The trinomial expression is .

The trinomial compare to general trinomial expression: , So a = 4, b = 4, c = 35.

To find two numbers with a sum of 4 and a product of .

This trinomial list of the factors of 140, and look for the pair of factors is a sum of 4.

Factors of 140	Sum of factors
\ 2, 70 \ 7, 20 \ 10,14 \	\ 68 \ 13      \ \ \ 4 \

The correct factors are 10 and 14.

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)

Product of two different sings is negative.

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

The solution is "true".

The solution is .