if a measure of an angle is -2x^2+19x and the measure of it's supplement is 4x^2-6 what's the measure of angle and supplement
If you know what a supplement is, this should be no trouble.
(-2x^2 + 19x) + (4x^2 - 6) = 180
2x^2 + 19x - 186 = 0
(x-6)(2x+31) = 0
x = 6
The two angles are 42° and 138°