For this, you can use the quadratic formula. -b+_(b^2-4ac)^0.5 x= ---------------------------- 2a
Now we get the variables a, b, and c from this equation: Ax^2+bx+c=0 Now if you want an explanation of how that equation works, I will derive and explain it for you if you let me know you want me too.
x^2+4x-4=0 Ax^2+bx+c=0 So the variables a,b, and c stand for the coefficients infringed of each x. So if we combine the two equations, we find that: a=1 b=4 c=-4
Now that we have only one unknown variable (aka variable (x)), we can substitute the numbers into the quadratic equation.
The answers is 3/9 which you can check by reducing. It reduces to 1/3. Basically you go 1/3 = x/9 then cross multiple to get 9=3x do the division so 3x/3 and 9/3 and you get 3/9.