Graphing

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SSAT Upper Level Quantitative › Graphing

Questions 1 - 10
1

What coordinate point is the orange triangle on?

Screen shot 2015 07 29 at 3.26.44 pm

Explanation

To find the location on a coordinate plane we first look at the -axis, which runs horizontal and then the -axis, which runs vertical. We write the point on the -axis first, followed by the point on the -axis.

The orange triangle is over on the -axis and up on the -axis.

2

What coordinate point is the orange triangle on?

Screen shot 2015 07 29 at 3.26.44 pm

Explanation

To find the location on a coordinate plane we first look at the -axis, which runs horizontal and then the -axis, which runs vertical. We write the point on the -axis first, followed by the point on the -axis.

The orange triangle is over on the -axis and up on the -axis.

3

Multiply the complex conjugate of by . What is the result?

Explanation

The complex conjugate of a complex number is , so the complex conjugate of is . Multiply this by :

4

Multiply:

Explanation

This is a product of an imaginary number and its complex conjugate, so it can be evaluated using this formula:

5

Multiply the complex conjugate of 8 by . What is the result?

None of the other responses gives the correct product.

Explanation

The complex conjugate of a complex number is . Since , its complex conjugate is itself. Multiply this by :

6

Multiply the complex conjugate of by . What is the result?

None of the other responses gives the correct product.

Explanation

The complex conjugate of a complex number is . Since , its complex conjugate is .

Multiply this by :

Recall that by definition .

7

Starting at the coordinate point shown below, if you move up and to the left , what is your new point?

Screen shot 2015 07 30 at 9.21.38 am

Explanation

The starting point is at . When we move up or down we are moving along the -axis. When we move to the right or left we are moving along the -axis.

Moving up the -axis and moving right on the -axis means addition.

Moving down the -axis and moving left on the axis means subtraction.

Because we are moving up , we can add to our coordinate point and because we are moving to the left we can subtract from our coordinate point.

8

Multiply the following complex numbers:

Explanation

FOIL the product out:

To FOIL multiply the first terms from each binomial together, multiply the outer terms of both terms together, multiply the inner terms from both binomials together, and finally multiply the last terms from each binomial together.

Recall that i is an imaginary number and by definition . Substituting this into the function is as follows.

9

Add to its complex conjugate. What is the result?

Explanation

The complex conjugate of a complex number is , so has as its complex conjugate; the sum of the two numbers is

10

Give the product of and its complex conjugate.

The correct answer is not given among the other responses.

Explanation

The product of a complex number and its conjugate is

which will always be a real number. Therefore, all four given choices, all of which are imaginary, can be immediately eliminated. The correct response is that the correct answer is not given among the other responses.

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