geometry/notes before 7
TRANSCRIPT
Radical Expressions
Operations on Radical Expressions• How can I simplify radical expressions?• How can I preform mathematical operations on
radical expressions?• How can I find the Geometric Mean between two
numbers?
Radical Expressions• Radical = square root symbol
• Perfect squares – multiply two numbers by themselves
• But life isn’t always perfect!
Radicals• Radical Expressions – an expression with a square
root
• Radicand – the expression under the radical sign
• We are going to simplify
Product Property• so….• If you just have a number under the square root• Step 1 – find the prime factorization of the number• Step 2 – find pairs of the same number• Step 3 – put the one from each pair in front of the radical
Radicands with numbers• Simplify:
Adding and Subtracting Radical Expressions• The radicand must be the same.
• Which expressions can be added to 3?
• 10• 10
Adding/Subtracting
Unlike Radicands• Simplify the radicands to see if they have like
radicands
Multiplying Radicals
• Step 1 – multiply the numbers• Step 2 – put the results under a square root• Step 3 – simplify as before
Multiplying Radicals• You can only multiply inside numbers with inside
numbers and outside numbers with outside numbers
Homework• Radical Quiz Friday!
• Worksheet
Quotient Property• so…
• but…
• NO RADICALS IN THE DENOMINATOR!
Rationalizing the Denominator
• Step 1 – multiply both the top and bottom of the fraction by the bottom
• Step 2 – the denominator will now be the number without a radical sign
• Step 3 – simplify the numerator, if possible
Rationalizing the Denominator• Simplify:
Geometric Mean• Geometric Mean – The geometric mean between
two numbers is the positive square root of their product.
• The two numbers are a and b, x is the geometric mean
• Use cross products and square roots
Examples• Find the geometric mean between each pair of
numbers:
1. 4 and 4
2. 4 and 63. 6 and 94. ½ and 2
Examples
Given the mean
Homework
• Worksheet• Radical Quiz Friday!