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If x - 4 = 9, what is the value of x^2 - 4?
  1. 77
  2. 165
  3. 81
  4. 21
Explanation

x - 4 = 9

Add 4 to both sides:

x = 13

Now, let's calculate x^2 - 4:

x^2 - 4 = (13)^2 - 4

= 169 - 4

= 165

So, the correct answer is: 165

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