Which of the following values is equal to − (−8.2)?

- (-8.2)if u didn't already know, if u have a sign next to the parenthesis, there is a constant of 1...it is not written but it is understood.

so if it helps, look at ur problem like this..
-1(-8.2)and remember, a neg. times a neg. equals a positive

so ur answer is simply : 8.2

Sorry i didn’t know i had

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2