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Multiplying a Trinomial by a Binomial

In this video, we are going to look at how to multiply a trinomial by a binomial.
For example:
To multiply (x+3)(x^2+2x-5) we have to distribute each term in the binomial to each term in the trinomial.
When we distribute the x to the terms in the trinomial, we get x^3, 2x^2, and  -5x. When we distribute the 3 to the trinomial, we get 3x^2, 6x, and -15. So now we are left with
x^3+2x^2-5x+3x^2+6x-15
From here, we want to combine like terms, to give us a final answer of
x^3+5x^2+x-15

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