$\"\"$

The expression is $\"\"$

$\"\"$ (Substitute $\"\"$ )

$\"\"$

Apply the order of operations (PEDMAS). \ \

Since there are no parenthesis, first operation is evaluating power.

$\"\"$ (Evaluate power: $\"\"$ )

Next operation is multiplication.

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

Next operation is subtraction.

$\"\"$ (Subtract: $\"\"$ and $\"\"$ )

Next operation is division.

$\"\"$ (Divide: $\"\"$ )

$\"\"$

The value of the expression is 1.6.