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Using the quadratic formula, the roots of the equation 3x^2-6x-30 are x= -4 and x= -2
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3x^2 -6x-30=(3)(x^2 - 2x - 10)

3x^2 - 6x - 30 is an example of a polynomial containing common monomial factor.
gcmf = first factor
polynomial (over) gcmf = second factor

Simple as that.
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