The parabolas defined by the equations y = -x^2 - x + 3 and y = 2x^2 - 1 intersect at points (a, b) and (c, d), where c is greater than or equal to a. What is c - a? Express your answer as a common fraction.
You are only looking for the 'x' coordinates of the poits of intersection ....so
-x^2-x+3 = 2x^2-1
3x^2+x - 4 = 0 x = 1 and - 4/3 <===== you can finish