Among Spainâs indigenous animals are a wide variety of deer, Iberian wild goats, tortoises, bats, snakes, and small reptiles and amphibians.
Solving Systems of Equations by Substitution Method. Substitution is the most elementary of all the methods of solving systems of equations. Substitution method, as the method indicates, involves substituting something into the equations to make them much simpler to solve.
Solving Quadratic Equations. There are many ways to solve quadratic equations, such as factoring, taking square roots, completing the square, and using the quadratic formula. Factoring involves setting each factor equal to zero and solving each factor. When the quadratic has a squared part and a number part (for example, ), take the square root.