The perfect square binomial obtained by adding a constant to the expression : x² – 18x is

(x +9)²

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(x – 3)²

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(x + 3)²

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(x – 9)²

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Solution

The correct option is D
(x – 9)²

x² – 18 x

x² – 18 x + (-18/2)²

Because b = -18 / 2 (half of the coefficient of x)

(x – 9) ²

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