Order of Operations:

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To simplify the expression follow the order of operations: (PEMDAS)

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1.      Evaluate the expressions inside the Parenthesis/Brackets (P).

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2.      Evaluate Powers/Exponents (E).

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3.      Multiply and/or Divide in order from left to right (MD).

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4.      Add and/or Subtract in order from left to right (AS). 

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A simple technique for remembering the order of operations is turned

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into phrase "Please Excuse My Dear Aunty Sally"\"\"

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The expression is \"\"

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\"\"                   (Substitute x = 3, y= 4 and z = 5)

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First  operation is inside the parenthesis.

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\"\"                            (Subtract: \"\")

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\"\"                                  (Subtract: \"\")

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Next operation is multiplication.

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\"\"                                        (Multiply: \"\")

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Next operation is addition.

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\"\"                                              (Add: \"\")\"\"

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The value of the expression is 7.