A rectangle is bounded by the graph of y=x^2-9 and the x-axis. a) Express the area A of the rectangle as a function of x. b) For what value of x is A the largest?

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.