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How will you write ( (x+7)(x+7) ) as an identity form?

Answer and explanation

Correct answer: ( (x+7)^2 )

When the same algebraic factor is multiplied by itself, the product is its square: \\(A\cdot A=A^2\\). Here the repeated factor is \\(x+7\\), so \\((x+7)(x+7)=(x+7)^2\\). Expanding it would give \\(x^2+14x+49\\), which is also consistent with the identity \\( (x+y)^2=x^2+2xy+y^2\\) for \\(y=7\\).

Therefore option A is correct. Option B changes the plus sign to a minus sign and represents a different expression. Options C and D correspond to the difference of squares, \\((x+7)(x-7)=x^2-49\\), not to two identical factors. The essential recognition is that repeated multiplication of one expression is written as a power of 2.

Related tags

Square FormBinomialIdentity Recognition

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