To multiply a binomial and a trinomial:
1) Arrange the terms of each factor in a grid with the correct exponents.
2) Multiply corresponding terms and combine like terms.
3) The result is a polynomial with the sum of the exponents of like terms.
2. Step 1:the first step you have to put the numbers in the correct boxes. (5x2+4x+9)(7x-2) 5x 2 +4x 7x -2 (5x2+4x+9) (7x-2) +9 35x 3 28x 2 63x -10x 2 -8x -18