$\"\"$

The standard form of the complex number is $\"\"$ , where a and b are real numbers.

The expression is " $\"\"$ ".

$\"\"$ (Apply the formula : $\"\"$ )

$\"\"$

$\"\"$ (Imaginary unit : $\"\"$ )

$\"\"$

$\"\"$ .

$\"\"$

The standard form of the complex number is $\"\"$ .