f(x) in function notation is the same as y. f(x)=x is the same as y=x.
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document.write( "x intercept is when y=0 (when the function touches the x axis). y intercept is when x=0 (when the function touches the y axis.) Find the x intercept by setting y = 0 then solving the equation for x. Find the y intercept by setting x=0 then solving the equation for y.
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document.write( "y intercept: 
. Set x=0: 
The y intercept is y=0.
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document.write( "x intercept: set y=0: 
square both sides 
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document.write( "4x(2x+1) = 0
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document.write( "Either factor can = 0.
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document.write( "4x=0
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document.write( "x=0 is one x intercept.
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document.write( "(2x+1)=0
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document.write( "2x = -1
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document.write( "x = -1/2 is the other x intercept.
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