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