Question

Plot the complex number 5i and find its absolute value

Answer 1

check the picture below.


`\bf 5i\implies \stackrel{a}{0}~~\stackrel{b}{+5}i\implies \stackrel{\stackrel{absolute~value}{modulus}}{r=√(a^2+b^2)}\implies r=√(0^2+5^2)\implies r=5`