Question 950499
a and b are integers
a*b=21
a=21/b
a=5b-8 Substitute for a
21/b=5b-8 Multiply each side by b
21=5b^2-8b Subtract 21 from each side.
0=5b^2-8b-21*[invoke quadratic "b", 5, -8, -21 ]
The integer answer is 3 so ANSWER: One of the numbers is 3.
a=21/b=21/3=7 ANSWER 2: The other integer is 7.
CHECK:
a=5(b)-8
7=5(3)-8
7=15-8
7=7