Numbo the maths kitten
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Maths with Numbo
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One-One and Onto Functions
4
questions
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Choose the best answer
1
Is f(x) = x³ from R to R a one-one function?
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A
Yes, it is one-one
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B
No, it is not
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2
Is f(x) = x² from R to R a one-one function?
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A
No, because f(2)=f(-2)
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B
Yes, it is one-one
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3
A function that is both one-one and onto is called what?
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A
Bijective
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B
Constant
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4
What does it mean for a function to be onto?
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A
Every element in the codomain has a pre-image
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B
Every domain element has a unique image
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