Transcript 2.13 Notes - Brookwood High School

Questions from HW???
2.13
Use Square Roots to Solve
Quadratic Equations
2.10-2.13 Test: FRIDAY!!!!
Vocabulary


If b2 = a then b is a square root of
a.
All positive real numbers have two
square roots


A positive square root (or principle
square root) and a negative square
root.
This is written as
b  a b   a
2
Vocabulary


A square root is
written with the
radical symbol
The number or
expression inside
the radical symbol
is the radicand.
Vocabulary

The square of an integer is called a
perfect square.
Example 1:

Solve the equation:

x2 – 7 = 9

z2 + 13 = 5
Example 2:

Solve 9m2 = 169
Example 3:

Solve 2x2 + 5 = 15
Example 4:

Solve 3(x + 3)2 = 39
You Try:

w2 – 9 = 0

4r2 – 7 = 9

2(y + 4)2 = 18
Classwork:

P. 121 #2-24 EVENS