\(8 x^{2} -24x\) is not in equation form, and you gave no question as to what to find. If it says to factor, it can be \(8x(x-24)\). If it is asking to find x when \(8 x^{2} -24x\) is equal to 0, then it is \(x=0,24\). I hope one of those answers the question you meant to ask.