Question

(x) = x³ + 2x² + 3x − 1 no ponto P(1,-1)

Answer 1

X = (1)³ + 2(1)² + 3(1) -1
X = 1+1+3-1 
X = 4

X=(-1)³ + 2(-1)² + 3(-1) -1
X = -1 +2 - 3 - 1 
X = -3