 In this video we provide the solution to question number nine for practice exam two for math 1050 We have to solve the quadratic inequality x minus one times x plus four is greater than zero Which this is actually quite fortune to us that we've already compared one side to zero Which is what we want. We want this in the standard quadratic form. It's also already factored for us x minus one and x plus four there So if we draw our line here and think of our markers that is what are the roots of that quadratic equation? There's one marker at one. There's another marker at negative four like so The leading coefficients are both positive there. So our parabola would concave upward So this is the basic picture we want right here when you look at greater than zero This suggests that we want to be above the x-axis. So we are going to grab the wings of the bird here and So we would see that the correct answer would be negative infinity up to negative four Union one to infinity like we see with choice B right here Notice that negative four and one are not included in the solution because we only have greater than zero not greater than equal to zero So we grab the word the we grab the wings of our bird here and get choice B