1.

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

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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