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`(x^2-4x-21)=?`A. `(x-7)(x-3)`B. `(x+7)(x-3)`C. `(x-7)(x+3)`D. None of these |
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Answer» Correct Answer - C `(x^2-4x-21)=(x^2-7x+3x-21)`. `=x(x-7)+3(x-7)=(x-7)(x+3)`. |
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