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According to the fundamental theorem of algebra, which polynomial function has exactly 8 roots?
(a) (8x3-5x2-6)(7x5-2),
(b) (15x3+4x+1)5,
(c) (x2+13)6,
(d) (7x7-5x5+3x3)(2x2+x).
6. The graph of f(x) = 34 + 8x3 is concave down on the interval (-5, -1) ® (-4,0) © (0,00) 0 (-0,-4) ® (-2,2)
9. To evaluate the integral - r* - 2.x² + 4x +1 Ir-r-x+1 dx, one would use the method of “partial fractions". A proper x-2x +4x+1. decomposition of the integrand - x-r-x+1 [Hint: x-x-x-1=(x-1)(x2-1)], A BC B A B A ) x+1+ C B C - +- C) x+1+ - +- + X-1 (x-1)2 x+1 x-1(x-1)*x+1 X-1 1-1 1+1 DA E) none of these