Question

Graph the function and determine the interval(s) (if any) on the real axis for which f(x) ≥ 0. Use a graphing utility to verify your results.
f(x)=X^2-4X

Answer 1

the real roots are 0 and 4
the minimum point is (-2,4)
f(x) > or equal to 0 when
x is less than or equal to zero or greater than or equal to 4