8+6+(-3)
=14+(-3)
=11
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six plus negative eight is two
The sum is negative 8.
-6 + 8 is the same as 8 - 6 is 2
-6 + +8 = +2
-3√6 + 8√6 = ? Assuming that's what you meant then: -3√6 + 8√6 = (-3 + 8)√6 = 5√6 5√6 = √25√6 = √150 = 12.2474487 (approx 12.25)