Question 827657
Solution : 

(x - 4) (x - 9) = 0 
multipling each term of first bracket by the second term we get , 
 
 x(x - 9) - 4(x - 9) = 0 
x^2 - 9x - 4x + 36 = 0
x^2 - 13x + 36 = 0 

Thank you .