Question 637544
Let y = x^2 -3, your quadratic reduces to 
y^2 - 11y + 30 = 0 which factors into
(y-6)(y-5)=0 yielding
y = 5,6 or 
x^2 - 3 = 5,6 or
x^2 = 8,9
x= 2sqrt(2),3