Practice the method of completing the square with quadratic expressions.

khanacademy.org

Solve quadratic equations of the form ax^2+bx+c=0 that can be rewritten according to their linear factors.

khanacademy.org

Solve quadratic equations using the quadratic formula. For example, solve -9x+10x²+8=14.

khanacademy.org

Graph quadratic functions given in the standard form ax²+bx+c. For example, graph y=5x²-20x+15.

khanacademy.org