Free Practice Question
PS · Problem Solving
sub-505
Functions
In a defined operation *, for any numbers s and t, the expression is given by s*t = (s - 2)(t + 2). If (-3)*y = -20, what is the value of y?
Answer Choices
Correct answer marked belowA
1
2
Correct
C
4
D
5
E
8
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Explanation
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Official Explanation
Official
The operation * is defined as s*t = (s - 2)(t + 2). Given that (-3)*y = -20, we can substitute into the operation:…
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Comments
3
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A
AmanFeb 25, 2024
This is exactly what I needed to practice
Z
ZhouFeb 12, 2024
Great!
N
NganMay 27
thanks
What this question tests
What it tests
Your ability to evaluate and compose functions, including unusual defined operations.
Common trap
Applying function operations in the wrong order or ignoring domain restrictions.
Details
Difficulty
sub-505
Type
PS
Category