Free Practice Question
PS · Problem Solving
sub-505
Algebra
If 20x + 25 = 0, then 20|x| equals which one of the following?
Answer Choices
Correct answer marked belowA
20
B
–25x
C
20x
25
Correct
E
25x
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Explanation
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Official Explanation
Official
Solution Given: • 20x + 25 = 0
To find: • Value of 20|x| Approach and Working: • 20x + 25 = 0 o x = o |x| = o 20|x| = 25…
To find: • Value of 20|x| Approach and Working: • 20x + 25 = 0 o x = o |x| = o 20|x| = 25…
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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
sub-505
Type
PS
Category