misal f(x)=1+2x+3x2 dan g(x)=1-2x+3x2-4x3 jika h(x)=f(x)+g(x) maka nilai h(-1)

jawab

f(x)= 1 + 2x + 3x^2
g(x) = 1 - 2x  + 3x^2 - 4x^3
...............................................(+)
f(x) + g(x) = 2 + 6x^2 - 4x^3

h(x) = f(x) + g(x)
h(-1) = 2 +6(-1)^2 - 4(-1)^3
h(-1) = 2 + 6 + 4
h(-1) = 12