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The Algebra Buster
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Square Roots and Real Numbers

Square Roots and Real Numbers

If , then x is a square root of y . A rational number, like 81, whose square root, 9, is a rational number, is called a perfect square . The number 81 has two square roots, 9 and - 9. The radical sign is used to indicate a nonnegative or principal square root. For example, A square root of a positive rational number that is not a perfect square is an irrational number. An irrational number is a number that cannot be expressed in the form , where a and b are integers and b 0. The set of rational numbers and the set of irrational numbers together form the set of real numbers . The graph of the set of all real numbers is the entire number line.

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graphing general functions 
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Just take a look how incredibly simple Algebra Buster is:

Step 1 : Enter your homework problem in an easy WYSIWYG (What you see is what you get) algebra editor:

Step 2 : Let Algebra Buster solve it:

Step 3 : Ask for an explanation for the steps you don't understand:

Algebra Buster can solve problems in these areas...

simplification of algebraic expressions (operations with polynomials (simplifying, degree, synthetic division...), exponential expressions, fractions and roots (radicals), absolute values) 
factoring and expanding expressions 
finding LCM and GCF 
operations with complex numbers (simplifying, rationalizing complex denominators...) 
solving linear, quadratic and many other equations and inequalities (including basic logarithmic and exponential equations) 
solving a system of two and three linear equations (including Cramer's rule) 
graphing curves (lines, parabolas, hyperbolas, circles, ellipses, equation and inequality solutions) 
graphing general functions 
operations with functions (composition, inverse, range, domain...) 
simplifying logarithms 
basic geometry and trigonometry (similarity, calculating trig functions, right triangle...) 
arithmetic and other pre-algebra topics (ratios, proportions, measurements...)
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$58.99
Only: $39.99!
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good until November 20th
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