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What is the relation between (x^2-4) and (x^2+4x+4)?

Answer and explanation

Correct answer: The first is a difference of squares and the second is a perfect square

The direct answer is option A. The first expression is \(x^2-4 = x^2-2^2\), so it has the form \(a^2-b^2\) and is a difference of squares. It can also factor as \((x-2)(x+2)\). The second expression is \(x^2+4x+4\). Since \(4x\) is \(2\cdot x\cdot 2\) and \(4=2^2\), it matches \(x^2+2xy+y^2=(x+y)^2\), giving \((x+2)^2\); it is a perfect square. Option A states both classifications correctly. Option B says the expressions are equal, but they are not equal for general x; for example, at \(x=1\) they are \(-3\) and \(9\). Option C reverses the two types. Option D is wrong because both expressions contain \(x^2\) and are quadratic, not linear. Memory cue: \(a^2-b^2\) has a minus sign; \(a^2+2ab+b^2\) forms a square.

Related tags

Identity RecognitionDifference Of SquaresPerfect Square

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