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**slapmaxwell1** ok im trying to do a matrix, or get the determinant from a matrix, but every time i enter it, i get this data type error? can someone tell me why?

first off im doing a variation of parameter problem and i need to find the eigenvalues of this 2x2 matrix.

where lambda should be im inserting an x, i figure once i get the result i could solve for x and then get my lamba values.

the matrix is 3 -5

3/4 -1

can someone show me how to enter this into my calc without getting the error messages.

thanks in advance