Jamila solves the quadratic equation x2 + 3x – 10 = 8 (see her work below). When she checks her solutions, they do not make the equation true. However, Jamila cannot find her mistake. Explain her error and then solve the quadratic equation correctly. Homework Help ✎
When solving a quadratic equation, it is important to set one side equal to zero.
x2 + 3x − 18 = 0