Once again, Greta is in a pickle! She is trying to solve the following equation and knows she can use u-substitution to do it: Homework Help ✎

3 tan² x − tan x − 10 = 0

1. Greta thinks if she lets u = tan x she can write the problem as a quadratic equation. Show Greta she is correct.

2. Use your answer to part (a) to find the value(s) of x.