1.

X²+4x-21 by x+7please give answer fast

Answer»
{x}^{2}  + 4x - 21 \\  = (x  + 7)(x - 3) \\ dividing \:  \: we \:  \: get \\  \frac{(x + 7)(x - 3)}{(x + 7)}  \\  = (x - 3)


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