[math] \newcommand{\ex}[1]{\item } \newcommand{\sx}{\item} \newcommand{\x}{\sx} \newcommand{\sxlab}[1]{} \newcommand{\xlab}{\sxlab} \newcommand{\prov}[1] {\quad #1} \newcommand{\provx}[1] {\quad \mbox{#1}} \newcommand{\intext}[1]{\quad \mbox{#1} \quad} \newcommand{\R}{\mathrm{\bf R}} \newcommand{\Q}{\mathrm{\bf Q}} \newcommand{\Z}{\mathrm{\bf Z}} \newcommand{\C}{\mathrm{\bf C}} \newcommand{\dt}{\textbf} \newcommand{\goesto}{\rightarrow} \newcommand{\ddxof}[1]{\frac{d #1}{d x}} \newcommand{\ddx}{\frac{d}{dx}} \newcommand{\ddt}{\frac{d}{dt}} \newcommand{\dydx}{\ddxof y} \newcommand{\nxder}[3]{\frac{d^{#1}{#2}}{d{#3}^{#1}}} \newcommand{\deriv}[2]{\frac{d^{#1}{#2}}{dx^{#1}}} \newcommand{\dist}{\mathrm{distance}} \newcommand{\arccot}{\mathrm{arccot\:}} \newcommand{\arccsc}{\mathrm{arccsc\:}} \newcommand{\arcsec}{\mathrm{arcsec\:}} \newcommand{\arctanh}{\mathrm{arctanh\:}} \newcommand{\arcsinh}{\mathrm{arcsinh\:}} \newcommand{\arccosh}{\mathrm{arccosh\:}} \newcommand{\sech}{\mathrm{sech\:}} \newcommand{\csch}{\mathrm{csch\:}} \newcommand{\conj}[1]{\overline{#1}} \newcommand{\mathds}{\mathbb} [/math]

Perform each of the indicated operations and write the answer in the form [math]x + iy[/math].

• [math](3+i4)+(7-i3)[/math]
• [math](-2+i\sqrt2)+(-2-i\sqrt2)[/math]
• [math](-2+i\sqrt2)(-2-i\sqrt2)[/math]
• [math]\frac{3-i7}{2+i}[/math]
• [math](a+ib)(2a-i2b)[/math]
• [math]2(4-i3)+7(-2+i5)[/math]
• [math]\frac{-3+i4}{4-i3}[/math]
• [math]\frac{7+i}{-2-i5}[/math]
• [math]\frac{a+ib}{3a-i3b}[/math]
• [math]\frac{-2-i}{2-i}[/math]
• [math]\frac{25}{3-i4}[/math]
• [math](2+i7)(2-i5)[/math].