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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.

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

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – JonMark Perry, Watson, Nikunj, MCT, Emilio Novati
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ 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
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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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