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Question

Simplify the following expression.

\((2x + 3y)^{2} - (2x - 3y)^{2} + 12xy\)

This question was previously asked in
RRB Group D 2025 Question Paper (18-Aug-2026) (Shift 1)
The correct answer is

\(36xy\)

Use the identity \(a^{2} - b^{2} = (a+b)(a-b)\).

Here \(a = 2x + 3y\) and \(b = 2x - 3y\), so \(a + b = 4x\) and \(a - b = 6y\).

Therefore \((2x+3y)^{2} - (2x-3y)^{2} = 4x \times 6y = 24xy\).

Adding the remaining term: \(24xy + 12xy = 36xy\).

Hence, the simplified value of the expression is \(36xy\).

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Important Questions from Algebra

  1. In the given question, two equations numbered l and II are given. Solve both the equations and mark the appropriate answer.

    I. x2 – 26x + 165 = 0

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  4. If a number and its reciprocal added it becomes 6, then what will be sum of its square and square of its reciprocal?

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