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^{2}=x and y=√x so different? They're supposed to be the same, aren't they? I'm usually good at maths but I honestly don't understand this. Can someone explain please? Thanks :).

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- Thread starter noahsdev
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- #1

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- #2

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They are not different.

But do not forget the sign (+or-) in front of the square root.

And you have to plot x=y², not y=x². Since your drawing tool draws the ordinate as a function of the abscissa and that you have to plot x as a function of y (not y as a function of x as usual), you have to rotate the sheet of paper (the axes) of 90°

But do not forget the sign (+or-) in front of the square root.

And you have to plot x=y², not y=x². Since your drawing tool draws the ordinate as a function of the abscissa and that you have to plot x as a function of y (not y as a function of x as usual), you have to rotate the sheet of paper (the axes) of 90°

Last edited:

- #3

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They are not different.

But do not forget the sign (+or-) in front of the square root.

And you have to plot x=y², not y=x². Since your drawing tool draws the ordinate as a function of the abscissa and that you have to plot x as a function of y (not y as a function of x as usual), you have to rotate the sheet of paper (the axes) of 90°

Thankyou!! They are different, but your comment helped me understand why :). The y=√x is only the positive side, but when you simplify the x=y

- #4

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Call me a pedant, but generally you shouldn't "rotate the graph" - you should "reflect the graph" in the line y=x. In this particular case it happens to produce the same result.They are not different.

But do not forget the sign (+or-) in front of the square root.

And you have to plot x=y², not y=x². Since your drawing tool draws the ordinate as a function of the abscissa and that you have to plot x as a function of y (not y as a function of x as usual), you have to rotate the sheet of paper (the axes) of 90°

- #5

Mark44

Mentor

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^{2}=x and y=√x so different? They're supposed to be the same, aren't they? I'm usually good at maths but I honestly don't understand this. Can someone explain please? Thanks :).

The two graphs ARE different. The graph of y =√x is the upper half of the graph of yThey are not different.

But do not forget the sign (+or-) in front of the square root.

And you have to plot x=y², not y=x². Since your drawing tool draws the ordinate as a function of the abscissa and that you have to plot x as a function of y (not y as a function of x as usual), you have to rotate the sheet of paper (the axes) of 90°

- #6

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The figure in my preceeding post was there in order to explain what I mean, better than with words.

Noahsdev said that he understood it.

All's well that ends well.

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