-43
(-7/2 + √17/2) ≈ -1.438 and (-7/2 - √17/2) ≈ -5.562
17
53
3 5 7 11 13 17 19
The two numbers you multiply together to equal 391 are 17 by 23.
-1
-241
1 and 17.
17
-17
the three prime numbers that equal 17 are _+_+_=17
Not sure about 720 but if the answer were to be 72 then the two numbers are 8 and 9 8 x 9 = 72 8 + 9 = 17