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Which of the following is/are perfect squares?(a) 16a2 + 36b2 − 48ab(b) 9x2 + 18xy + 9y2(c) Both (a) and (b)(d) Neither (a) nor (b)

Question

Which of the following is/are perfect squares?

(a) 16a^2 + 36b^2 − 48ab
(b) 9x^2 + 18xy + 9y^2
(c) Both (a) and (b)
(d) Neither (a) nor (b)

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Solution

To determine which of the given expressions are perfect squares, we need to simplify each expression and check if they can be written as the square of a binomial.

(a) 16a^2 + 36b^2 - 48ab: To check if this expression is a perfect square, we can factor it. 16a^2 + 36b^2 - 48ab = (4a - 6b)^2 Since we can write it as the square of a binomial, expression (a) is a perfect square.

(b) 9x^2 + 18xy + 9y^2: Similarly, we can factor this expression to check if it is a perfect square. 9x^2 + 18xy + 9y^2 = (3x + 3y)^2 Therefore, expression (b) is also a perfect square.

(c) Both (a) and (b): Since we have determined that both expression (a) and expression (b) are perfect squares, the correct answer is (c) - Both (a) and (b).

(d) Neither (a) nor (b): This option is incorrect since we have found that both expression (a) and expression (b) are perfect squares.

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