Perfect Squares, Variables and Numbers

Which of these can ONLY BE factored using difference of two squares?

• 144x² - 49y²

• x² + 4x - 12

• 100x² + 20x + 1

• 14x - 16

√49

• 5

• 3

• 6

• 7

• No, b/c a square root is always irrational.

• No, b/c it's root is a decimal.

• Yes, b/c it simplifies to -6 and 6

• Yes, b/c it can be rounded.

This exponential expression, 20² written as a perfect square is __________.

• 40

• 4

• 400

• 4000

√196

• 15

• 13

• 12

• 14

√225

• 1

  13

• 16

• 18

• 15

√256

• 14

• 16

• 13

• 17

What perfect square statement is modeled?

9x² - 49y⁶

• ( 3x + 7y³) (3x + 7y³) 

• ( 3x - 7y³) (3x + 7y³) 

• ( 3x - 7y³) (3x - 7y³) 

• Prime

• (5x-9)²

• (5x+9)(5x-9)

• 25(x-9)²

• (9x+5)(9x-5)