Browse · MATH
Printjmc
algebra senior
Problem
Two parabolas are the graphs of the equations and . Give all points where they intersect. List the points in order of increasing -coordinate, separated by semicolons.
Solution
First, set the two equations equal to each other to get . Combine like terms to get . Then, we can divide by to get . To complete the square, we need to add to both sides, giving .
So we have . Solving for gives us or . Using these in our original parabolas, we find the points of intersection to be and .
So we have . Solving for gives us or . Using these in our original parabolas, we find the points of intersection to be and .
Final answer
(-2, 23)