Question 849531

There is no reason to do step b)

X^2-2X-13 = 0
X^2-2X=13 
step c is wrong
square 1/2 of the coefficient of x
2/2=1 squared  equals 1

(X-1)^2=14 
x-1=+-sqrt(14)
X = 1+sqrt(14)
X = 1-sqrt(14)