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Solving Quadratic Equations — Test Answers

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The Davidson family wants to expand its rectangular patio, which currently measures 15 feet by 12 feet They want to extend the length and width the same amount to increase the total area of the patio by 160 ft squared Which quadratic equation best models the situation? cap A is equal to l w

A
2 times open paren 15 plus x close paren plus 2 times open paren 12 plus x close paren is equal to 15 times 12 plus 160
B
open paren 15 plus x close paren times open paren 12 plus x close paren is equal to 15 times 12 plus 160
C
15 times 12 plus x times x is equal to 15 times 12 plus 160
D
15 x times 12 x is equal to 15 times 12 plus 160
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The solutions to a quadratic equation are x is equal to 2 and x is equal to 7 If k is a nonzero constant, which of the following must be equal to the quadratic equation?

A
k open paren x plus 2 close paren open paren x plus 7 close paren is equal to 0
B
open paren x plus 2 close paren times open paren x plus 7 close paren plus k is equal to 0
C
open paren x minus 2 close paren times open paren x minus 7 close paren plus k is equal to 0
D
k open paren x minus 2 close paren open paren x minus 7 close paren is equal to 0
8

Adding two functions results in h of x is equal to 4 x , while multiplying the same functions results in j times x is equal to negative 5 x squared minus 12 x minus 4 Which statements describe f of x and g of x , the original functions? Choose two correct answers.

A
Both functions must be quadratic.
B
Both functions must have a constant rate of change.
C
Both functions must have a y -intercept of 0 .
D
The y -intercepts of f of x and g of x must be opposites.
E
The rate of change of f of x and g of x must be opposites.
13

The square of 9 less than a number is 3 less than the number. What is the number?

A
negative 12 or 7
B
negative 12 or negative 7
C
negative 7 or 12
D
7 or 12
15

Use the zero product property to find the solutions to the equation open paren x plus 2 close paren times open paren x plus 3 close paren is equal to 12

A
x is equal to 2 or x is equal to 3
B
x is equal to negative 3 or x is equal to negative 2
C
x is equal to negative 1 or x is equal to 6
D
x is equal to negative 6 or x is equal to 1
16

Two functions are combined resulting in the function j times x is equal to 1 point 5 x squared plus 4 x minus 3 Which operations applied to the specified functions could result in j times x ? Choose three correct answers.

A
two linear functions by addition
B
two quadratic functions by multiplication
C
two quadratic functions by addition
D
a linear function and a quadratic function by addition
E
two linear functions by multiplication
17

Two functions are combined resulting in the function j times x is equal to negative 3 x squared plus 5 Which operations applied to the specified functions could result in j times x ? Choose three correct answers.

A
two linear functions combined by addition
B
a linear function and a quadratic function combined by addition
C
two quadratic functions combined by multiplication
D
two linear functions combined by multiplication
E
two quadratic functions combined by addition
18

A contractor is calculating the number of decorative stones for a new rectangular patio. The bids always include a count for the number of stones for the edging, cap e times x , and the number of stones for the center of the patio, cap c times x The various patio sizes have lengths represented by the function f of x and widths represented by g of x x cap e times x is equal to 2 times open paren f plus g close paren of x cap c times x is equal to open paren f times g close paren of x 2 34 62 3 52 133 4 70 260 5 88 435 Which statement describes the combined functions cap e times x and cap c times x ?

A
Both the number of stones needed for the edge and the number of stones for the center have a constant rate of change.
B
The number of edge stones needed has a constant rate of change, but the number of stones for the center does not.
C
Neither the number of stones needed for the edge nor the number of stones for the center has a constant rate of change.
D
The number of stones for the center has a constant rate of change but the number of edge stones needed does not.
19

Adam is using the equation x times open paren x plus 2 close paren is equal to 255 to find two consecutive odd integers with a product of 255 When Adam solves the problem using the zero product property, what do those solutions represent?

A
two possible “first” integers
B
a possible “first” integer and a possible “second” integer
C
two possible “second” integers
D
the two consecutive odd integers with a product of 255

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