Which of the following graphs of a quadratic function satisfies the condition given below?

a < 0; b² - 4ac = 0

Find a quadratic function that satisfies the following conditions.

x-intercepts: (4, 0) and (7, 0)

y-intercept: (0, 14)

Find the coordinates of the closest point on the line y = 3x to the point (2, 14). Use the distance formula.

Graph the quadratic function and find out the vertex, axis, domain, and range of the quadratic function.

h(x) = (x - 11)² -2