Simplifying radicals including variables and solving quadratic equations by taking the square roots.

1. Lesson 4 pt2
February 05, 2014
Your turn!
2
72
8
3
3 225x
80x
1
2
4 3
288x y

2. Lesson 4 pt2
February 05, 2014
Another method for solving quadratics (finding the roots)
Taking the Square Root of each side of the equation
examples:
touch here
for
next step
*isolate the "squared" term
*then take the square root of both sides
2
1. x = 324
x2 = 324
touch here
for
next step
2
x + 5 = 23
-5 -5
touch here
for
next step
x = 18
x2=18
x2 = 18
x=3 2
Click for
answer

3. Lesson 4 pt2
February 05, 2014
Solve each quadratic equation
2
2(x+5) -3 = 45
+3 +3
2
2(x+5) = 48
2
2
2
(x+5) = 24
3x2= 36
You try:
2
(x-7) -5 = 75
2
(x+5) = 24
x+5 = 2 6
-5 -5
x = -5 +2 6
2
(x+2) = 28