In Emily's physics class, she had to solve the equation 9 = 12at2 + ut for u. Each step of her work is shown below. Use the drop-down menus to explain each step.

Answer:[tex]u=(9-\frac{1}{2}at^{2})/t[/tex]Step-by-step explanation:we have[tex]9=\frac{1}{2}at^{2}+ut[/tex]Solve for uThat means-------> isolate the variable ustep 1Subtract  [tex]\frac{1}{2}at^{2}[/tex] both sides[tex]9-\frac{1}{2}at^{2}=ut[/tex]step 2Divide by  [tex]t[/tex] both sides[tex]u=(9-\frac{1}{2}at^{2})/t[/tex]