Solve by making a u-substitution.x4 - 21x2 + 20 = 0
A. {±1, ±2
}
B. {±2, ±2}
C. {±1, ±2
}
D. {±1, ±
}
Answer: A
Mathematics
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Multiply.(
- 3)(
+ 3)
A. x
+ 3
- 3
- 9
B. x
+ 
- 9
C. x
- 9
D. x
- 9
Mathematics
Simplify the expression.25-3/2
A. -125
B. 125
C. - 
D. 
Mathematics
Find the equation of a circle satisfying the given conditions.Center: (5, -5); radius: 
A. (x - 5)2 + (y + 5)2 = 2 B. (x + 5)2 + (y - 5)2 = 4 C. (x - 5)2 + (y + 5)2 = 4 D. (x + 5)2 + (y - 5)2 = 2
Mathematics
Divide. Write the answer in lowest terms and as a whole or mixed number where possible.15 ÷ 
A. 5
B. 6
C. 
D. 35
Mathematics