# Occasionally my calculator will multiply, divide, add or subtract 'k' from my equation. 'k' is always a different value, usually something I recently used. I have been unable to find 'k' on my calculator, except when it does this. As far as I can tell, there is no pattern to when it occurs.

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Posted on Jan 02, 2017

SOURCE: Non functional keys

don't use those keys

Posted on Apr 06, 2008

Usually you enter the first number then you press the key ( +, -, x or /) corresponding to the operation you want to perform and you press the equal sign (=).
ex: 15+3=18

Often you can perform the operations one after the other without bothering with the intermediate results. You can do so provided you respect the priority rules: parentheses,powers, multiplication/division, addition/subtaction...)

Hope it helps

Posted on Aug 18, 2009

Hello,
To raise a number to some power other than 2 or 3, you use the [y to the x] key. Exemple 2[y to the x] 5 = 2x2x2x2x2=32.
Hope it helps.

PS. I could not understand what you wanted with those expressions.

Posted on Sep 17, 2009

SOURCE: how do i program my

Press MODE to bring up the mode screen. Use the arrow keys to move down to the line beginning "Real". Highlight either "a+bi" or "re ^ theta i" depending on whether you want to work in rectangular or polar coordinates, then press ENTER to save the change. Press 2ND [QUIT] to exit the mode screen.

Posted on Feb 17, 2011

This post is rather exhaustive as regards the matrix capabilities of the calculator. So if the post recalls things you already know, please skip them. Matrix multiplication is at the end. As to division of matrices, I do not believe that this operation exits.

Let me explain how to create matrices. (If you know how to do it, skip to the operations on matrices, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.

The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2: D A T A] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB (MUST have identical dimensions same m and same n, m and n do not have to be the same)
To subtract MatA-MatB. (MUST have identical dimensions, see above)
To multiply MatAxMatB (See below for conditions on dimensions)
To raise a matrix to a power 2 [x2], cube [x3]
To obtain inverse of a SQUARE MatA already defined MatA[x^-1]. The key [x^-1] is the x to the power -1 key. If the determinant of a matrix is zero, the matrix is singular and its inverse does not exit.

Dimensions of matrices involved in operations must match. Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular numbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrix by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

Posted on May 10, 2011

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I've only shown the fraction part of your question as 1 is a whole number.
1/2 = 2/4, or 4/8, or 8/16 or 16/32 or 32/64 & so on.
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