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# CALC 1 Expressions Calculator

This calculator plots expressions as well as calculations for solving, integration and more.
This calculator will only work in ALG calculation mode.
If you do not have a key labeled "plot" in the top row, change the calculation mode to ALG in options. The calculator status at the top of the display shows 4 numbers in square brackets: [-10, 1, 5, 10]. The first and last numbers are the minimum and maximum values for x used for plotting. The 2 middle values are used for shading and calculations. These values can be changed by entering a new value and pressing the STO key followed by the xMin, x1, x2 or xMax keys on the top row of keys.

As described in the ALG calculation mode documentation, pressing the "K" key will toggle the "K mode". In "K mode" key presses no longer append to the expression. This allows entering different values of "rgx" for the expression or to STO new values for the plot minimum and maximum.

## Expressions calculator keys:

Tap the link on the key name for an example.

plot - Plots the current expression from rgx =  xMin to xMax. The expression should be a function of 'rgx'.

plot(n)- Plots 1-5 expressions that have been stored (STO) in exprna to exprne (2nd row of keys after pressing STO or RCL).

shade p - Plots the current expression from rgx = xMin to xMax, shading the area from x1 to x2.

solve(y) - Solves the current expression for the value of rgx that will result in the value entered. After entering an expression, press the K key to enter "K mode", then enter the goal, then press the solve(y) key.

dxdy(x) - Calculates "dxdy" for the current expression for the value of rgx. After entering an expression, press the K key to enter "K mode", then enter the rgx value, then press the dxdy(x) key.

intg - Integrates the current expression from rgx = x1 to x2. The integrated area will match the shaded area from the "shade p" key.

### Shifted keys

maxY - Calculates the value of rgx that will result in the maximum value of the current expression from x1 to x2. After calculating the value of rgx, pressing the "=" key (in "K mode"!) will evaluate the current expression and display the maximum value.

minY - Calculates the value of rgx that will result in the minimum value of the current expression from x1 to x2. After calculating the value of rgx, pressing the "=" key (in "K mode"!) will evaluate the current expression and display the minimum value.

exprna=b - Calculates the value of rgx where the result of exprna = exprnb from x1 to x2. After calculating the value of rgx, either expression can be recalled and pressing the "=" key (in "K mode"!) will evaluate the current expression and display that value. You can visually verify the results using the "plot(n)" key for 2 expressions, exprna and exprnb.

shade[] - Plots the current expression from rgx = xMin to xMax, shading multiple areas with the limits of the shaded areas set in the values of listx.

param - Plots a parameter plot with the x values from exprna and the y values from exprnb.