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Factorize `x^2-4x-21`. |
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Answer» The given expression is `x^2-4x-21`. We split -4 into two whose sum is -4 and product -21. ` therefore x^2-4x-21 =x^2-7x+3x-21`. `=x(x-7)+3(x-7)` `=(x-7)(x+3)`. Hence, `x^2-4x-21=(x-7)(x+3)`. |
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