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- Thread starter melissax
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- Feb 7, 2012

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The essential thing about a function is that there should be only one value of $y$ for each value of $x$. Can you see one of those formulas where there might be more than one value of $y$ for a given value of $x$?Hi, I have a question and couldnt solve.

Can you help me?

Which one isnt function how i can show?

(a) $y = |x^3 + 5|$

(b) $y = x^2 + \sqrt(x) -\sin(x)$

(c) $y^2 = (x-5)^2 + 10$

(d) $y^3 = x + 4$

Thank you?

- Jan 26, 2012

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You should have been taught the 'vertical line test' .....Hi, I have a question and couldnt solve.

Can you help me?

Which one isnt function how i can show?

(a) y = |x^3 + 5|

(b) y = x2 + sqrt(x) -sin(x)

(c) y2 = (x-5)^2 + 10

(d) y3 = x + 4

Thank you?

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If the given relation can be expressed as $\displaystyle y=f(x)$, then it is a function. Only one of the given relations cannot be written this way.

Try solving them for