Question

(y^2+6y-6)-(y^2+5y-8)

Answer 1

you want to combine the like terms.

so y^2 and y^2 should be combined
the y's should be combined,
and the plain number should be combined.

Answer 2

but note that you're subtracting!!

Answer 3

please show equation.

Answer 4

(y^2-y^2) = 0
(6y-5y) = 1y = y
(-6 - -8) = -6 + 8 = 2

so simplified, it would be 0 +y+2 = y+2