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This is a Challenge math problem that was on my math book. 

Challenge The function y=xhas a U-shaped graph called a parabola. If the domain of this function is given as x≥0 and x≤4, find the range.

Please help me. Thanks.

  

 Jul 22, 2014

Best Answer 

 #6
avatar+33661 
+10

If the domain is from x=0 to x = 4 then the range of y = x2 is from y = 0 to y = 16.  It includes all real numbers not just integers.

It often helps to draw a graph:

xsquared

 Jul 23, 2014
 #1
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+5

The range can be written as:

Y≥0

 

Which means Y must be greater than or equal to 0.

 Jul 22, 2014
 #2
avatar+8262 
+5

Thanks, Anonymous. Are you sure that is the answer?

 Jul 22, 2014
 #3
avatar+89 
+10

The range is for integers of 0^2, 1^2, 2^2, 3^2, 4^2

These are 0, 1, 4, 9, 16

The range is 0 to 16 answer is these squared that is 0, 1, 4, 9, 16 is answer

So range is 0 to 16 include 16

Please excuse bad English

Thank you

 Jul 22, 2014
 #4
avatar+8262 
+5

It is okay, SquareRoot. I can uderstand it. +5 points for you! I can excuse your bad english.

 Jul 22, 2014
 #5
avatar+89 
+5

Mlle Melody

Question please

Is top answer true also.

Range stop at 16 not go higher is that right?

 Jul 22, 2014
 #6
avatar+33661 
+10
Best Answer

If the domain is from x=0 to x = 4 then the range of y = x2 is from y = 0 to y = 16.  It includes all real numbers not just integers.

It often helps to draw a graph:

xsquared

Alan Jul 23, 2014
 #7
avatar+118687 
+5

Yes as Alan has shown you,

If the domain is confined to  $$0\le x\le4$$

then the range is   $$0\le y \le 16$$

 Jul 23, 2014
 #8
avatar+8262 
+5

Thanks, guys!

 Jul 24, 2014

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