Radical Equations and Extraneous Roots Answers
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1
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Which equation is equivalent to ?
A
x + 11 = 225B
x + 121 = 225C
StartRoot x EndRoot = 15 + 11
D
StartRoot x EndRoot = 15 minus 11
2
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Which of the following is a radical equation?
A
x + StartRoot 5 EndRoot = 12
B
x squared = 16
C
3 + x StartRoot 7 EndRoot = 13
D
7 StartRoot x EndRoot = 14
3
The formula that relates the length of a ladder, L, that leans against a wall with distance d from the base of the wall and the height h that the ladder reaches up the wall is . What height on the wall will a 15-foot ladder reach if it is placed 3.5 feet from the base of a wall?
A
11.5 feetB
13.1 feetC
14.6 feetD
15.4 feet4
Which equation can be rewritten as x + 4 = x2? Assume
A
StartRoot x EndRoot + 2 = x
B
StartRoot x + 2 EndRoot = x
C
StartRoot x + 4 EndRoot = x
D
StartRoot x squared + 16 EndRoot = x
5
What is the solution of ?
A
x = twelve-fifths
B
x = negative twelve-fifths
C
x = –6 or x = –3D
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