Unit Test — Unit test Answers

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21
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In which quadrant is the number 6 – 8i located on the complex plane?

A
I
B
II
C
III
D
IV
22
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Use the zero product property to find the solutions to the equation 6x2 – 5x = 56.

A
x = –8 or x =
Option A
B
x = or x =
Option B
C
x = or x =
Option C
D
x = or x =
Option D
23

Which statement about the following equation is true?2x2 – 9x + 2 = –1

A
The discriminant is less than 0, so there are two real roots.
B
The discriminant is less than 0, so there are two complex roots.
C
The discriminant is greater than 0, so there are two real roots.
D
The discriminant is greater than 0, so there are two complex roots.
24

Solve for in the equation .

Question illustration
A
x = negative 4 plus-or-minus StartRoot 37 EndRoot i
Option A
B
x = –4 ± 5i
C
x = 4 plus-or-minus StartRoot 37 EndRoot i
Option C
D
x = 4 ± 5i
25

Which equation represents a graph with a vertex at (–3, 2)?

A
y = 4x2 + 24x + 38
B
y = 4x2 – 24x + 38
C
y = 4x2 + 12x + 2
D
y = 4x2 + 16x + 13

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