Question 923836
f(x) = (x-7)(x+4) is a parabola that crosses the x axis at (-4,0) and (7,0), the equation can be rewritten as
f(x) = x^2 -3x - 28
note that the parabola crosses the y axis at (0,-28) and it opens upward
a)  x < -4 or x > 7
b)  -4 < x < 7