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Mathguy.us – Developed specifically for math students from Middle School to College, based on the author's extensive experience in professional mathematics in a business setting and in math tutoring. Contains free downloadable handbooks, PC Apps, sample tests, and more.
definitions, explanations and examples for elementary and advanced math topics. Purple Math – A great site for the Algebra student, it contains lessons, reviews and homework guidelines.
Legs of a Right Triangle: The legs of a right triangle are the two shorter sides of the right triangle. Legs are adjacent to the right angle. opposite: The opposite of a number \(x\) is \(−x\). A number and its opposite always sum to zero. Pythagorean Theorem
A function is a rule which operates on one number to give another number. However, not every rule describes a valid function. This unit explains how to see whether a given rule describes a valid function, and introduces some of the mathematical terms associated with functions.
This handbook supplies a collection of mathematical formulas and tables which will be valuable to students and research workers in the fields of mathematics, physics, engineering, and other sciences.
triangle are called the legs. The third side (opposite the 90 an. le) is called the hypotenuse. So in Fig. 6.1 the hypotenuse has length , a. d the legs have len. in “the hypotenuse is ”). The usage is gen. rally clear from the context. The standard notation for a right angle is a li. Figure 6.1.
A function is a rule which assigns to a real number a new real number. The function f(x) = x3 2x for example assigns to the number x = 2 the value 23 4 = 4. A function is given with a domain A, the points where f is de ned and a codomain. B a set of numbers which f can reach. Usually, functions are de ned everywhere, like the function f(x) = x2 2x.
