Please help give a good explaintion cause my teacher said to show my work

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Its due ! write an equation in which the quadratic expression 2x^2-2x 12 equals 0. show the expression in factored form and explain what your solutions mean for the equation. show your work.

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared