Today in class Dr. Eviatar gave us Exercise 10: Factoring Difference of Squares questions 1-20. DO NOT do questions 8, 9, 12 -16 and 18. If you weren't in class today and you forgot your textbook in your locker here are the questions:

1.a.) x² - 16
b.)36t² - 1


2.a.) 4a² - b²
b.) 8c² - 72


3.a.) 81 - (x + 7)²
b.) (x - 1)² - (x + 1)²


4.a.) x^8 - y^12
b.)4x² - 1


5.a.) 4m² - 25y^4
b.) 121x² - 196y²


6.Simplify: [(3x²)(4x³)]²

7.Simplify: x³ + x³ + x³


10. How many rectangles occur in this figure?



11. Solve for x:
a.) x / 2 + 1= x / 3 - x - 1 / 2


b.) (x + 2 )(x + 3) = x² + x


17. If the area of a rectangle is (x³ - 1) square units and one side is (x + 1) units, what is the length of the other side?

19. Divide: (5x³ + 1 - 10 x) by (5 + 5x)

20. Factor Completely:
a)15x² + 37x +20
b) 9y² + 12xy + 4x²
c) 20a² + 20a -75



The next scribe is going to be Madelyn.