The expression is .

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

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

2.     Evaluate Powers/Exponents (E).

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

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

A simple technique for remembering the order pf operations is turned into phrase

“Please Excuse My Dear Aunty Sally”

First operation is Evaluate the expressions Parenthesis.

= [36 - 3(2 + 5)]                     (Evaluate power: 6² = 36)

= [36 - 3(7)]                            (Add: 2 + 5 = 7)

= [36 – 21]                              Multiply: )

= 15                                          (Subtract: 36 – 21 = 15)

The value of expression is 15.