3x2 has x, x2 , and 3 as factors. 2x-5 does not have any of those as factors. So the greatest common factor is 1. If you were adding rational expressions with those two expressions in the denominator, you would need to multiply them together to find the least common denominator.
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3x(2x + 1)
(x - 1)(3x + 5)
(x - 2)(2x + 7)
It is a quadratic equation.
Yes.