day 2 square roots
Post on 17-Dec-2014
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Warm up
3 4
5
A farmer knows he needs to grow an area of 81 km2 of corn to make a profit. His field is a square. How long are the sides of his corn field?
Warm up correction
Homework correction
So, what is
a ratio
nal number a
gain?
Are the following numbers rational?Why?
-7/10
-12
2.34
0.666....
0.172458917245891724589....
So, are all numbers rational then?
Square root of a number
Square of a number a:
The number times itself : axa = a2
Examples:
Square root of a positive number b:
·a number c so that c2= b
·Each positive number has a positive and negative square root
·The notation for the positive square root of a number is √
Example:
Perfect squares
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