What is the whole square of x+2?

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• A x^2+4
• B 2x+4
• C x^2+4x+4
• D x^2+2x+4

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Answer: C. x^2+4x+4

Use (a + b)^2 = a^2 + 2ab + b^2: (x + 2)^2 = x^2 + 2(x)(2) + 4 = x^2 + 4x + 4. Option a forgets the middle term 4x.

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