Question

How do I multiply a polynomial by a binomial?

Answer 1

Distributive property.

$a(b+c)=ab+ac$

$(a+b)(c+d)=a(c+d)+b(c+d)=ac+ad+bc+ad$

$(a+b+c)(d+e)=a(d+e)+b(d+e)+c(d+e)=ad+ae+bd+be+cd+ce$

and so on.