4. Which of the following mathematical statements is showing difference of two squares? A. (40 - 30)(4c + 3d) = 16c2 - 60 B. (9x + 5y)(9x - 5y) = 45x? - 7y2 C. (6c2 – 3bc)(6c? + 3bc) = 6c4 - 18bc D. (9ab + ab) (ab - Tab) = 81a²b2 - 49c4
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A.(40-30)(4c + 3d)=16c2-60
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