## College Algebra (6th Edition)

The quadratic formula is used for solving equations of the form $ax^{2}+bx+c=0$ (polynomial equations of degree 2). It generally does not apply when solving equations of a higher degree, for example, $x^{3}+2x-x+2=0$ can not be directly solved with the quadratic formula Note: some higher degree equations can be reduced (using substitutions) into a quadratic form, but the vast majority of equations can not. Verdict: doesn't make sense.