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All that can be said is that F(x) is a quadratic function of x, with two real roots.
F(x) = 15x2 - 2.5 + 3 That's a quadratic or 2nd degree polynomial in x.
No, they are not equivalent.
To find f(-3), we substitute -3 into the function f(x) = x^2 + x: f(-3) = (-3)^2 + (-3) = 9 - 3 = 6
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