Factoring That Include Special Factors

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Factor:

25x² - 100y²

• ( 5x - 10y) (5x + 10y)

• ( 5x - 10y)²

• Prime

• ( 5x - 50y) (5x + 50y)

Is this a perfect square trinomial?
x² + 16x + 64

• Yes

• No

Which of the following is NOT a perfect square trinomial?

• x² – 16x + 64 

• x² – 10x + 20 

• x² – 28x + 196 

• x² – 24x + 144