Exercises 11-20, sketch the graph of the quadratic function, identify vertex and x intercepts.Exercise 21, graph the quadratic function. Identify vertex and x intercept. Write it in standard form.

11. f(x) = (x + 4)2 - 3 12. f(x) = (x - 6)2+ 3 13. h(x) = x2 - 8x + 16 14. g(x) = x2 + 2x +1 15. f (x) = x2 - x+ 16. f(x) = x2+ 3x + 17. f (x) = -x2+2x +5 18. f(x) = -x2 - 4x +1 19. h(x) = 4x2 - 4x + 21 20. f(x) = 2x2 - x +1 In Exercises 21-26, use a graphing utility to graph the quadratic function. Identify the vertex and x-intercept(s). Then check your results algebraically by writing the quadratic function in standard form. 21. f(x) = - (x2+ 2x - 3)