Question
Download Solution PDFLet, f: R→R: f(x) = x2 - 17. What is the pre-image of -1
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
If f(x) = y, we say, y is the image of x under f and x is the pre-image of y under f
Calculation:
Here, f: R→R: f(x) = x2 - 17
⇒f(x) = -1
⇒ x2 - 17 = -1
⇒ x2 = 16
⇒ x = -4, 4
So, -4, 4 are the pre-images of -1.
Hence, option (3) is correct.
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