Emily plans to use the quadratic formula, while Juan is considering using the graphing method to find exact solutions of 3x2 – 8x = 20. Using complete sentences, explain who has chosen the better method and why.

Question

anonymous · Answer

*3x^2-8x=20

rogue · Answer

Emily chose the better method because this curve has irrational roots that Juan cannot get the exact values of from graphing. It has irrational roots because the discriminant of this polynomial is 304, which is not a perfect square number.