All GMAT Math Resources
Example Questions
Example Question #1 : How To Graph Complex Numbers
Give the -intercept(s) of the parabola with equation . Round to the nearest tenth, if applicable.
The parabola has no -intercept.
The parabola has no -intercept.
The -coordinate(s) of the -intercept(s) are the real solution(s) to the equation . We can use the quadratic formula to find any solutions, setting - the coefficients of the expression.
An examination of the discriminant , however, proves this unnecessary.
The discriminant being negative, there are no real solutions, so the parabola has no -intercepts.
Example Question #821 : Geometry
In which quadrant does the complex number lie?
-axis
When plotting a complex number, we use a set of real-imaginary axes in which the x-axis is represented by the real component of the complex number, and the y-axis is represented by the imaginary component of the complex number. The real component is and the imaginary component is , so this is the equivalent of plotting the point on a set of Cartesian axes. Plotting the complex number on a set of real-imaginary axes, we move to the left in the x-direction and up in the y-direction, which puts us in the second quadrant, or in terms of Roman numerals:
Example Question #2 : How To Graph Complex Numbers
In which quadrant does the complex number lie?
If we graphed the given complex number on a set of real-imaginary axes, we would plot the real value of the complex number as the x coordinate, and the imaginary value of the complex number as the y coordinate. Because the given complex number is as follows:
We are essentially doing the same as plotting the point on a set of Cartesian axes. We move units right in the x direction, and units down in the y direction, which puts us in the fourth quadrant, or in terms of Roman numerals:
Example Question #1 : How To Graph Complex Numbers
In which quadrant does the complex number lie?
If we graphed the given complex number on a set of real-imaginary axes, we would plot the real value of the complex number as the x coordinate, and the imaginary value of the complex number as the y coordinate. Because the given complex number is as follows:
We are essentially doing the same as plotting the point on a set of Cartesian axes. We move units left of the origin in the x direction, and units down from the origin in the y direction, which puts us in the third quadrant, or in terms of Roman numerals:
Example Question #231 : Coordinate Geometry
In which quadrant does the complex number lie?
If we graphed the given complex number on a set of real-imaginary axes, we would plot the real value of the complex number as the x coordinate, and the imaginary value of the complex number as the y coordinate. Because the given complex number is as follows:
We are essentially doing the same as plotting the point on a set of Cartesian axes. We move units right of the origin in the x direction, and units up from the origin in the y direction, which puts us in the first quadrant, or in terms of Roman numerals:
Example Question #1 : Graphing Complex Numbers
Raise to the power of four.
None of the other responses gives the correct answer.
Squaring an expression, then squaring the result, amounts to taking the original expression to the fourth power. Therefore, we can first square :
Now square this result:
Example Question #2 : Graphing Complex Numbers
Raise to the power of eight.
For any expression , . That is, we can raise an expression to the power of eight by squaring it, then squaring the result, then squaring that result.
First, we square:
Square this result to obtain the fourth power:
Square this result to obtain the eighth power: