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Product of binomial:
You can write it as:

Now, the product of trinomial:
You can write it as:

Hope this helps =)
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Multiplication of Binomial to Trinomial
( x+3)(x^2+2x+4) = n
   To solve n, do the distributive method.
x(x^2+2x+4) 3(x^2+2x+4)=x^3+2x^2+4x+3x^2+6x+12=x^3+5x^2+10x+12
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