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Finding Square Roots and Cube Roots with a Calculator by Sally Adams and Tanya Yount Finding Square Roots and Cube Roots with a Calculator by Sally Adams and Tanya Yount Intermediate Algebra CAI/Empacts Fall 2010 with Professor Rademacher • Solving Radical Expressions- Finding the Square Root: – Definition of a square root: For any real numbers a and b, if a2 = b, then a is a square root of b. Every positive real number has two real number square roots. The square roots are positive and negative. Negative numbers do not have real number square roots. The number 0 has just one square root, 0 itself. – Terminology: The symbol is called a radical sign. An expression written with a radical sign is called a radical expression. The expression written under the radical sign is called the radicand. Square root chart How to Find a Square Root on the TI-83 Calculator Finding the root of a number: For a square root, press the 2nd key and the x2 key. Enter the number you want to find the root of. Press ENTER. Solving Radical Expressions Finding the Cube Roots: Definition of a Cube Root: Taking the root of a number that can be split into 3 of the same number. - The cube root of 64 is = 4, because 4 x 4 x 4 = 64: Simplifying a Cube Root = 4 = 3 Here is a chart of cube roots that can help you understand cube roots. because 4*4*4 is = 64 because 3*3*3 is = to 27 How to Find a Cube Root on the TI-84 calculator • Push the math key on the calculator. • Click on the screen where you see . • Type number 64 . • Click ENTER. • The screen will say 4, which is the answer. • You get this screen when you click on the MATH button. References The Radicals Packet Cbroot.gif www.google.com www.techpoweredmath.com Stapel, Elizabeth. "Square Roots: Introduction & Simplification." Purplemath. Available from http://www.purplemath.com/modules/radicals.htm. Accessed 04 November 2010 http://www.wisconline.com/objects/ViewObject.aspx?ID=ENG7303