Free Practice Question
PS · Problem Solving
705-805
Algebra
If x^2−9x+|k|=0, where x is a variable and k is a constant, has two distinct roots. How many integer values can k take?
Answer Choices
Correct answer marked belowA
10
B
20
C
21
D
40
41
Correct
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Explanation
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What it tests
Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.
Common trap
Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.
Details
Difficulty
705-805
Type
PS
Category