ALGEBRA 2

Lesson 65 of 95

Students learn that when solving a polynomial equation such as (x + 1)(x - 8) = 10, the equation cannot be split up into two separate equations as a first step, because it is not set equal to zero. So the first step in this problem is to F.O.I.L. on the left side of the equation to get  more...

Students learn that when solving a polynomial equation such as (x + 1)(x - 8) = 10, the equation cannot be split up into two separate equations as a first step, because it is not set equal to zero. So the first step in this problem is to F.O.I.L. on the left side of the equation to get x^2 - 7x - 8 = 10, then subtract 10 from both sides to get x^2 - 7x - 18 = 0, then factor the left side to get (x - 9)(x + 2) = 0, then split things up into two separate equations: x - 9 = 0 and x + 2 = 0, and solve each equation from here to get x = 9 or x = -2.  less...