SOLUTION: write the eepression as a complex number in standard form (5 + 4i) + (-7 +9i)

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Question 81508: write the eepression as a complex number in standard form (5 + 4i) + (-7 +9i)
Answer by mathdoc316(9) About Me  (Show Source):
You can put this solution on YOUR website!
This is similar to simplifying an expression with x as a symbol or variable.
Here i is the imaginary unit, the square root of -1!
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.
But all you have to do here is combine the real parts, and combine the imaginary parts
%285+%2B+4i%29+%2B+%28-7+%2B9i%29
+5+%2B+%28-7%29+%2B+4i+%2B+9i
+-2+%2B+13i+
That is standard form - the standard form looks like a+%2B+bi where a and b are real numbers.