I don't know the calculator you are using, but you would want to graph y = x^2 + 6x - 16 and find the x-intercepts.
Your solution are the values of x for which the function is positive, that is, above the x-axis.
You should find the x-intercepts are -8 and 2 and that the function is a parabola opening upwards. This gives a solution of
x ≤ -8 or x ≥ 2.
Your solution are the values of x for which the function is positive, that is, above the x-axis.
You should find the x-intercepts are -8 and 2 and that the function is a parabola opening upwards. This gives a solution of
x ≤ -8 or x ≥ 2.