Sal expresses (x-4)(x+7) as the standard trinomial x^2+3x-28 and discusses how the general product (x+a)(x+b) can be written as x^2+(a+b)x+a*b.
Multiply binomials by binomials is a free educational video by Khan Academy.It helps students in grades 0 practice the following standards HSA.SSE.B.3.
1. HSA.SSE.B.3 : Choose and produce an equivalent form of an expression to reveal and explain properties of the quantity represented by the expression.
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