ab = 108 => a != 0, b != 0
so we CAN write b = 108 / a
a + 108 / a = 56
Multiply both side by a
a^2 + 108 = 56a. It's a simple quadratic equation, it will always have a solution over the Complex number, may be even REAL roots.
so when you are done with a, move on to b.
This is hardly abstract.
The numbers are -10 and -70
-8 and -8
-3 and 6
15 and -3
-4 and -25
26
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.
The numbers are -10 and -70
Urny ony
-8 and -8
-3 and 6
15 and -3
-4 and -25
95
-141
-8 and -4
-13