T graph represented a quadratic function of the form fx

Question

The graph represented a quadratic function of the form f(x) = (x - r₁)(x- r₂). The graph is drawn in the viewing rectangle -10 ≤ X ≤ 10 and -20 ≤ Y ≤ 20 with XSCL = 1 and YSCL = 5. Determine r₁ and r₂ and write the function in the form f(x) = ax² + bx+ c. Then use your graphing calculator to compare the graph of the function you found with the graph shown to verify your answer.