SOLUTIONS TO ALGEBRA REVIEW

 

1.        x² – 1 = 0                             2.   Expand (x-4)³

(x-1)(x+1) = 0                            = (x-4)(x-4)(x-4)

x = 1; x = -1                              = (x² – 8x + 16)(x – 4)

                                                 = x³ – 8x² + 16x – 4x² +32x –64

                                                 = x³ –12x² + 48x –64

 

3.       √ 1.44 = 1.2                            4.   Factor  x³ + 1               5.   Simplify x² +4x +3
                                                     = (x+1)(x² –x + 1)                               x + 1
                                                                                                              

                                                                                                     = (x+3)(x+1)

                                                                                                                  x+1

                                                                                                          =  x + 3