Find the measures of the interior angles of a triangle that has two exterior angles of 120 degrees and 150 degrees

360 - 120 - 150 = 90

Interior Angle 1 = 180 - 120 = 60°

Interior Angle 2 = 180 - 150 = 30°

Interior Angle 3 = 180 - 90 = 90°

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a