How do you simplify $(3+5i)-(6-21)$ ?

Jul 26, 2016

18 + 5i

By the 'usual' method of removing brackets and collecting 'like terms'.

That is : 3 + 5i - (-15) = 3 + 5i + 15 = 18 + 5i

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How do you simplify (3+5i)-(6-21)(3+5i)-(6-21)?