Find an expression for the bottom half of the parabola x+(y−1)2=0

 x + (y - 1)^2 = 0 
(y - 1)^2 = -x 
y - 1 = ± √(-x) 
y = 1 ± √(-x) 

The top half is y = 1 + √(-x) 
The bottom half is y = 1 - √(-x)

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Divide 40%5 and your answer is 8