Solving Equations in Quadratic Form

Each of the problems below is a link. If you click on the problem, it will take you to a YouTube video of a full, step-by-step solution for the problem. You may try these problems as practice and use the videos to check your answer, or you can just watch the videos to see more worked-out example problems.

Solve: x to the fourth minus 10x squared + 9 = 0
Solve: y to the fourth minus 8y squared minus 9 = 0
Solve: x minus 8 root x + 15 = 0
Solve: 2y + 5 root y = 12
Solve: m to the 2 thirds power minus 4m to the 1 third power + 3 = 0
Solve: 2 r to the 2 fifths power + 5 r to the 1 fifth power = 3