3, 5, and 7
?
find 3 consecutive odd integers such that the product of the first and the second exceeds the third by 8.
3 answers
Let x be the middle odd integer. Then the smaller odd integer is x-2, and the bigger is x+2
The problem requires that
x(x-2)-(x+2) = 8
or
x2 - 3x -10 = 0
Solution of the quadratic equation gives
x= -2 or x = 5
Since -2 is not an odd integer, it will be discarded.
Thus the three consecutive odd integers are
3,5,7
Check:
3*5-7=8 OK
The problem requires that
x(x-2)-(x+2) = 8
or
x2 - 3x -10 = 0
Solution of the quadratic equation gives
x= -2 or x = 5
Since -2 is not an odd integer, it will be discarded.
Thus the three consecutive odd integers are
3,5,7
Check:
3*5-7=8 OK
Find three consecutive odd integers such that the product of the first and the second exceeds the third by 8