I am trying to solve some equations for example: tanθ = 2/4 or tan15 = x/30 but I do not know how I would use a Calculator to solve these as I do not know how to format them or which symbols to use for θ and x, thanks.


closed as off-topic by JonMark Perry, Watson, Nikunj, MCT, Emilio Novati May 29 '16 at 15:13

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  • $\begingroup$ This is probably not the site for this. You should consult the manual or google. Anyway, there should be a function $\tan^{-1}$ (possibly above the $\tan$ button). Then to solve for $\theta$, punch in $\tan^{-1}(2/4)$. For the second one, punch in $30*\tan(15)$. You aren't literally going to put in $\tan \theta = 2/4$ in the calculator screen because it is a calculator not a solver. You do the solving. $\endgroup$ – Em. May 29 '16 at 13:02
  • $\begingroup$ Yes, Thank you very much. $\endgroup$ – alexo1001 May 29 '16 at 13:08

A TI-84 Plus cannot symbolically solve any equation, but there are two other options to solve equations:

  1. Algebraically on paper, and then use the calculator to get a decimal estimate.

  2. Graph both sides of your equation, and determine the intersection point(s). This will result in the solutions as well.


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