The love formula

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$$\huge x^2+(\frac{5y}{4} -\sqrt {|x|})^2=1$$ Just playing around, off course any non graphics calculator cannot render the graph. But its a cute equation.
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Solving a double exponent with one variable

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 A double exponent equation that is easily solved with the DM15L. The short program stores the keystrokes in the number 2 on the keypad or R2 registry.

$${2^3}^x=512$$

To solve for 'x' using a DM15L or HP15C enter the following keystroke program:

[f][PRGM] .... (Clears program memory and starts at line 001)
[g][P/R] .... (Starts program mode)
[f][LBL][2] .... (Stores the program in numeric keypad 2)
[3]  .... (The start of the equation with the first value)
[yx]
[2]
[x<>y] .... (swap the x and y registry) (Key 34, third row from the top, fourth column)
[yx]
[5][1][2]
[-]  .... (End of the equation)
[g][RTN]
[g][P/R]

To run the program enter the following

Enter a range between 1-5 that you guess the answer should lie 

[1] ENTER

[5]  .......(Don't press ENTER)

[f]

[SOLVE] ....... (Select the solver)

[2] ....... (The program is stored in the number 2 button)

Answer should be = 2, enjoy.

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