Answer
$13-3i$
Work Step by Step
Note: the standard form of a complex number is $a+bi$ where $i = \sqrt -1$ and $a$ and $b$ are real numbers.
Note: $i^{2} = \sqrt -1\sqrt -1 = -1$
$7+5i+2(3-4i)$
First, expand out the complex number:
$7+5i+6-8i$
Combine like terms, to express the complex number in standard form:
$13-3i$
