These 50 challenging algebra problems involve applying a variety of algebra skills. The exercises come with a good range of difficulty from milder challenges to very hard problems. On the page following each problem you can find the full solution with explanations.quadratic equationssystem of equationscross multiplyingfactoring and distributingthe f.o.i.l. methodroots and powersfractions and negative numbersslopes and y-intercepts of straight linesword problemsapplications