1.10. Rearranging Rows
Adding Rows
In the calculator window, you can add many rows of expressions, equations, and formulas. Just tap the "add button" underneath the previous expression as pictured below.
Alternatively, you can tap the enter key to type in a new equation or expression in the input field.
Rearranging Rows
The equations and expressions displayed in the workspace area appear in the order you input them. This section will explain how you can re-order and rearrange the entries without retyping them in the input field.
Examples
Factor each polynomial below.
1) x^2 - 3x + 2
2) x^2 - 4x + 4
3) x^2 - 16
Calculator solutions
1) Enter the expression as it appears in the problem: x^2 - 3x + 2 and hit the enter key.
2) Enter the expression as it appears in the problem: x^2 - 4x + 4 and hit the enter key.
3) Enter the expression as it appears in the problem: x^2 - 16
Examples
Factor each polynomial below.
1) x^2 - 3x + 2
2) x^2 - 4x + 4
3) x^2 - 16
Calculator solutions
1) Enter the expression as it appears in the problem: x^2 - 3x + 2 and hit the enter key.
2) Enter the expression as it appears in the problem: x^2 - 4x + 4 and hit the enter key.
3) Enter the expression as it appears in the problem: x^2 - 16
Now suppose that you want to rearrange the polynomials so that x^2 - 16 appears first in the list.
To rearrange the order of the polynomials as they appear in the workspace area:
1) Tap on the equation/expression that you want to move.
To rearrange the order of the polynomials as they appear in the workspace area:
1) Tap on the equation/expression that you want to move.
2) Hold and drag the equation/expression either left or right. Notice that it moves in the same direction.
3) Now, move the equation/expression to the desired row on the screen.
Note that x^2 - 16 is now the first polynomial displayed.
Note that x^2 - 16 is now the first polynomial displayed.
Example
Consider another case where it is necessary to re-order the rows in your calculations. Observe that if you enter an equation in the first line, the successive equation will be evaluated based on the result of the first. Refer to the example below:
First equation keyed in: 2x - 3 = 5
Second equation keyed in: x^2 - 3x + 2 = 0
Notice that instead of solving the second equation, the app evaluated the equation at x = 4 (the answer from the 1st equation). Thus, the display shows "FALSE" since the answer is not equal to 0.
Consider another case where it is necessary to re-order the rows in your calculations. Observe that if you enter an equation in the first line, the successive equation will be evaluated based on the result of the first. Refer to the example below:
First equation keyed in: 2x - 3 = 5
Second equation keyed in: x^2 - 3x + 2 = 0
Notice that instead of solving the second equation, the app evaluated the equation at x = 4 (the answer from the 1st equation). Thus, the display shows "FALSE" since the answer is not equal to 0.
If your objective was to check for the roots (solution) of the two equations: 2x - 3 = 5 and x^2 - 3x + 2 = 0, you can still check for them in the same workspace without retyping the second equation into a new workspace.
Just tap and hold the equation x^2 - 3x + 2 = 0 on the screen. Move it either left or right and then bring it forward (before 2x - 3 = 5).
Just tap and hold the equation x^2 - 3x + 2 = 0 on the screen. Move it either left or right and then bring it forward (before 2x - 3 = 5).
Observe that after moving the equation, we can see its solution. The roots are {1, 2}. However, the second equation 2x - 3 = 5 is now being evaluated at x = 1 or x = 2.
