what is the determinant of a 2x2 matrix

the determinant is calculated using the formula ad - bc where a,b,c and d are the following positions in the matrix [a   b                                                                                                                                                                                           c    d]

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Answered by Abdullah T. Maths tutor

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2x + y = 18; x−y=6


You are given a square which you are told has a total area of 100 squared centimetres. You are also told that one side of the square has dimension 4(3x + 2), and the other has dimension 8x - y. What are the values of x and y?


1) 3x + y = 11 2) 2x + y = 8


Solve the folllowing quadratic equation: y=x^2+x-6


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