Answer:
r(x) = x(x - 7)
Explanation:
given the roots of a parabola x = a , x = b , then
the corresponding factors are (x - a) and (x - b)
from the graph the roots are where the graph crosses the x- axis
the graph crosses the x- axis at x = 0 and x = 7 , then
the corresponding factors are (x - 0) and (x - 7) , that is x and (x - 7)
the equation is then the product of the factors , that is
r(x) = x(x - 7)