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Sticky Note
(x + 2)^2 = x^2 + 4x + 4 is?
  1. A linear equation
  2. Cubic equation
  3. An identity
  4. An equation
Explanation
  • The given equation (x + 2)^2 = x^2 + 4x + 4 is an identity because it is true for all values of x.
  • An identity is an equation that is always true, and this equation is simply the result of expanding the left-hand side using the binomial theorem.

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