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Draw a table for the function y=x^2+7x+y Y values needed are -7 to 0

 Oct 12, 2017
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Create a table for the function  y  =  x2 + 7x + y     for y values from -7 to 0.

 

This seems to be a strange question because:  y  =  x2 + 7x + y 

                          subtracting y from both sides:  0  =  x2 + 7x

and the y-term disappears!

So, solving for x:                                                0  =  x(x + 7)

      this means that either  x = 0  or  x = -7.

 

Thus, for every y-value, x has two possible values, either 0 or -7.

 Oct 12, 2017

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