Every week I always have to spend hours trying to understand what we did in the lesson, here's the latest thing that's making me feel worthless.

Solve the Quadratic Equation by completing the square leaving the answer in surd form

10 = 3x - x^2

rearranged i know it's

x^2 - 3 = 10 (i think)

Please help! (This is the hardest one, so if I can do this the others shouldn't present a problem)