Problem to solve:
Specify the solving method
Factor the polynomial $-x^2+4x$ by it's GCF: $x$
Learn how to solve quadratic equations problems step by step online.
Learn how to solve quadratic equations problems step by step online. Solve the quadratic equation -x^2+4x=0. Factor the polynomial -x^2+4x by it's GCF: x. Break the equation in factors and set each equal to zero, to obtain. Solve the equation (1). The variable is already isolated, so the solution is.