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You can find the formula here:

http://en.wikipedia.org/wiki/Inverse_of_a_matrix#Inversion_of_2.C3.972_matrices

Q: Explain how to find the inverse of a 2 x 2 matrix Do not use any special mathematical symbols in your explanation?

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A product in maths is found by multiplying numbers together. Not sure about the use of the word special?

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No, it is not an adverb. It is a verb and in one special case, a proper noun (Holy See).

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