You are given the quadratic 4x^2 - 5 = 3x + 4. You cannot apply the quadratic formula until this has been rewritten in the form y = ax^2 + bx + c. After re-arranging the terms, we get
4x^2 - 3x - 9 = 0. Then a=4, b= -3 and c= -9.
Then:
3 plus or minus sqrt(9-4(4)(-9)
x = ------------------------------------------
2(4)
