document.write( "Question 81508: write the eepression as a complex number in standard form (5 + 4i) + (-7 +9i) \n" ); document.write( "

Algebra.Com's Answer #58360 by mathdoc316(9) $\"\"$ $\"About$

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This is similar to simplifying an expression with x as a symbol or variable.\r
\n" ); document.write( "\n" ); document.write( "Here i is the imaginary unit, the square root of -1!\r
\n" ); document.write( "\n" ); document.write( "The complex numbers can be thought of as points in the complex plane. The horizontal axis looks like the x axis and it plots the \"real\" part of the complex number. The vertical axis looks like the y axis and plots the \"imaginary\" part of the complex number. So to plot a complex number like 5 + 4i you can think of the point (5,4) on the complex plane.\r
\n" ); document.write( "\n" ); document.write( "But all you have to do here is combine the real parts, and combine the imaginary parts\r
\n" ); document.write( "\n" ); document.write( " $\"%285+%2B+4i%29+%2B+%28-7+%2B9i%29\"$
\n" ); document.write( " $\"+5+%2B+%28-7%29+%2B+4i+%2B+9i\"$
\n" ); document.write( " $\"+-2+%2B+13i+\"$ \r
\n" ); document.write( "\n" ); document.write( "That is standard form - the standard form looks like $\"a+%2B+bi\"$ where a and b are real numbers.
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