



 
Hi Sam, Add $y$ to each side of the equation to get $x^2 + x + c  y = 0.$ You can now use the General Quadratic expression to write $x$ as an expression involving $y.$ This is the inverse of your function $y = x^2 + x + c.$ There is a $\pm$ in this expression and hence the inverse can be written as two expressions, one with the $+$ sign and the other with the $$ sign. I hope this helps,  


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