Question

C(x) =-x7+2x6+x5-3x4+5x3-2x2+x+4 para x=-2

Answer 1

C(x) = - x^7+2x^6+x^5-3x^4+5x^3-2x^2+x+4

para x= - 2

C(-2) = - (-2)^7 + 2.(-2)^6+ (-2)^5 -3.(-2)^4+5.(-2)^3 - 2.(-2)^2+ (-2) +4

C(-2)= - (-128) + 2.64 +(-32) - 3.16 + 5.(-8) - 2.4 - 2 + 4

C (-2) = 128+128 - 32 -48 - 40 - 8 + 2

C(-2) = 256 - 32 - 96 + 2

C(-2) = 224 - 94

C(-2) = 130