The graph of f(x) = (x + 4)6(x + 7)5 crosses the x axis at a root when it goes through the point (-2, -7). The graph of f(x) = (x + 13)(x – 12) crosses the x axis at a root when it goes through the point (-14, 144). . In this case, there are two roots: one for each factor in parentheses; that is, we have two possible points where a curve might cross an x-axis. There are many ways to find these roots using graphing calculators or other software packages available on computers and mobile devices; however, as an example of how to do so without any additional tools, solve multivariable linear differential equations by hand with pencil and paper.” Spoiler Alert! We will not be revealing which root has crossed over the x axis because you need to try it for yourself! The graph of f(x) = (x + 13)(x – 12) crosses the x axis at a root when it goes through the point (-14, 144). In this case, there are two roots: one for each factor in parentheses; that is, we have two possible points where a curve might cross an x-axis. There are many ways to find these roots using graphing calculators or other software packages available on computers and mobile devices; however, as an example of how to do so without any additional tools, solve multivariable linear differential equations by hand with pencil and paper.” Spoiler Alert! We will not be revealing which root has crossed over the x axis because you need to try it