Which expression is equivalent to (q^2 -16)

Which of the following is the result of expanding

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.