Sal expresses the area of a rectangle whose height is 4 and width is x^2+3x+2.
Multiply monomials by polynomials is a free educational video by Khan Academy.It helps students in grades 9,10,11,12 practice the following standards HSA.APR.A.1.
1. HSA.APR.A.1 : Understand that polynomials form a system analogous to the integers, namely, they are closed under the operations of addition, subtraction, and multiplication; add, subtract, and multiply polynomials.
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