Well for today, Dr. Eviatar helped us with some questions we didnt quite understand on **Exercise 10 - Factoring Difference of Squares**.

*She did some questions with us and here they are:*

**3. a.**

a² - b²

(a - b) (a + b)

81 - (x + 7)²

9² - (x + 7)²

↑

a² - b²

[9 - (x + 7)] [9 + (x + 7)]

[9 - x - 7] [9 + x + 7]

(2 - x) (16 + x)

**b.**

(x - 1)² - (x + 1)²

(x - 1) (x - 1) - (x +1)(x + 1)

(x² - 2x + 1) - (x² + 2 + 1)

x² - 2x + 1 - x² - 2x - 1

-2x - 2x

= -4x

**4. a.**

x^8 - y¹²

(x^4)² - (y^6)² =

(x^4 - y^6) (x^4 + y^6) =

(x² - y³) (x² + y³) (x^4 + y^6)

x² - 16

x² - 0x - 16

(x - 4) (x + 4)

**5. a.**

4m² - 25y^4

↑

(2m)² - (5y²)²

121x² - 196y²

(11x)² - (14y)

*Before classes ended*, she told us to

**study**the stuff we learned

*to be prepared*for our

**Pre-Test**tomorrow.

Now get studying for the

**REAL TEST**on Friday to be ready.

*& the next scribe will be :*

**- Good Luck!**

**Lia! :)**

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