28
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m n = 28
m + n = 0
Hence m = -n
Substitute
-n(n) = 28
-n^(2) = 28
n^(2) = -28
n = sqrt(-28)
n = sqrt(-1) X sqrt(28)
-14.88153 and 1.88153 (to 5 dp).
The two numbers you are looking for are 48 and -28. When multiplied together, 48 × -28 equals -1344, and when added, 48 + (-28) equals 20.
23 + 5
-146
-56