Remember to remove the GCF first. Recall the FOIL method for multiplication of binomials. Find two F irst terms with a product of ax 2 . Find two L ast terms with a product of c. If c is negative, the binomials will have different signs.
Signs are different since c is negative.
Consider the example below. Signs are both negative since c is positive and bx is nega tive. Check the sum of the outer and inner products. Any unauthorized duplication or distribution is prohibited.