For x +iy absolute value = √(x² + y²)
Absolute value of -4-√2i = -4-i√2, comparing x = -4, y= -√2
Absolute value = √( (-4)² + (-√2)²),
(-4)² = (-4)*(-4) = 16, (-√2)² = -√2 * -√2 = 2
= √( (-4)² + (-√2)²)
= √(16 + 4) = √20
√20 = √(4*5) = √4 * √5 = 2√5
Absolute value = 2√5