Răspuns:
x = I 3 - √8 I
x = I 3 - 2√2 I
x = 3 - 2√2
y = ( 1 + √2 )²
y = 1² + 2·1·√2 + (√2)² [ formula ( a + b )² = a² + 2ab + b² ]
y = 1 + 2√2 + 2
y = 3 + 2√2
Mg = √ a · b
Mg = √ ( 3 - 2√2 ) · ( 3 + 2√2 ) [ formula ( a - b )( a + b ) = a² - b² ]
Mg = √ 3² - ( 2√2 )²
Mg = √ 9 - 4 · 2
Mg = √ 9 - 8
Mg = √ 1
Mg = 1