Answer: 
x=9,-1  and 
Explanation:
we have been given with the quadratic equation 
we compare the given quadratic equation with general quadratic equation 
general quadratic is 
from given quadratic equation a=1,b= -8,c= -9
substituting these values in the formula for discriminant 

Now, to find the value of x 
Formula is 
Now, substituting the values we will get 

And rewritting the given equation by  shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of 
