AnswersAlgebra IQuadratic Equations

Quadratic Equations — Test Answers

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21
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What are the solutions to x squared plus 8 x plus 7 is equal to 0 ?

A
x is equal to 1 and x is equal to 7
B
x is equal to negative 7 and x is equal to negative 1
C
x is equal to 7 and x is equal to 8
D
x is equal to negative 8 and x is equal to negative 7
22
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Which equation results from taking the square root of both sides of open paren x minus 9 close paren squared is equal to 81 ?

A
x minus 3 is equal to plus or minus 9
B
x minus 9 is equal to plus or minus 9
C
x plus 3 is equal to plus or minus 9
D
x plus 9 is equal to plus or minus 9
23

Which equations can be used to find the lengths of the legs of the triangle? Choose three correct answers.

A
x times open paren x plus 2 close paren is equal to 24
B
x squared plus 2 x minus 48 is equal to 0
C
x squared plus open paren x plus 2 close paren squared is equal to 100
D
0 point 5 x open paren x plus 2 close paren is equal to 24
E
x squared plus 2 x minus 24 is equal to 0
24

What error did Zacharias make?

A
The 5 squared should be negative 5 squared .
B
The 2 in the numerator should be negative 2 .
C
The negative 5 should be 5 .
D
The 2 in the denominator should be negative 2 .
25

Which equation represents x , the side length of the greater square?

A
x squared plus open paren x minus 2 close paren squared is equal to 100
B
x squared plus open paren x minus 2 close paren squared is equal to 10
C
x squared plus 2 x squared is equal to 100
D
x squared plus 2 x squared is equal to 10

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Quadratic Equations — Test Answers — Algebra I