## Algebra 1

$(r-6)(r-7)$
List the pairs of numbers whose product is 42. 1,42 2,21 3,14 6,7 Determine which pair sums to 13, Since -13 is the coefficient of r and 42 is positive, both expressions of the binomial will be subtraction. $6+7=13$ $r^2-13r+42=(r-6)(r-7)$