The slope of the tangent to the curve x = t² + 3t $$-$$ 8, y = 2t² $$-$$ 2t $$-$$ 5 at the point t = 2 is

Let $$f(x) = {a_0} + {a_1}{x^2} + {a_2}{x^4} + {a_3}{x^6} + ... + {a_n}{x^{2n}}$$ be a polynomial in a real variable x with $$0 < {a_1} < {a_2} < {a_3} < .... < {a_n}$$, the function f(x) has