Step1: write out the equation
Looking at the equation it cannot be factorized, hence we use the quadratic formula method
Step2: write out the quadratic formula
where a=coefficient ofx²=1
b=coefficient of x=+4
c= constant =-1
Step3: Substitute the values into the formula above
Hence, by splitting the denominator we have
x=-2±√5
Therefore the right option is c