Graph the following equations on one Cartesian coordinate plane and describe the effect of the coefficient of x² on the graph's appearance:

y = x², y = 5x², y = 1/5x²

For the following function, graph and identify its domain's open intervals for which the function is increasing or decreasing. f(x) = 7x⁴

Consider the function f(x) = (x + 8)² and find the largest open interval of the domain at which the function is increasing and decreasing.