# Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 570: 30

$-12 + 26i$

#### Work Step by Step

Subtract each term of the subtrahend $=15i - 12 - (-11i) \\=15i -12 + 11i$ Regroup then simplify by combining like terms to obtain $=-12 + (15i + 11i) \\= -12 + 26i$

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