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In which quadratic form can (x^2+2xy+y^2) be seen?

Answer and explanation

Correct answer: ((x+y)^2)

The expression has the standard perfect-square pattern \(a^2+2ab+b^2=(a+b)^2\). Here the first square is \(x^2\), the last square is \(y^2\), and the middle term is \(2xy\). Thus the two quantities being added are \(x\) and \(y\), giving the square \((x+y)^2\). This identity works for all values of the variables.

Expanding confirms the result: \((x+y)^2=(x+y)(x+y)=x^2+xy+xy+y^2=x^2+2xy+y^2\). Hence option A is correct. The expression \((x-y)^2\) would have a negative middle term, namely \(-2xy\). The product \((x+y)(x-y)\) and the expression \(x^2-y^2\) both represent a difference of squares, not the given sum.

Related tags

Quadratic ExpressionsTwo VariablesPerfect Square

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