A complex number is a special type of number that takes the form of a + bi, where i is the symbol for the square root of 1. Can you figure out two complex numbers (where neither a nor b is zero) that when multiplied together become a real number?
Why do you multiply both the numerator and the denominator of the quotient by the complex conjugate ?
I am stuck on solving the problem below, writing the answers in standard form of a complex number, can you also show how it is worked out, thanks in advance.
(2 + 5i) (i  4) = 
Examples
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