Sketch the graph of each polynomial function below and identify all of the zeros. Homework Help ✎
y = x3 + 1
y = x3 – 8
These are both cubic functions, shifted vertically.
Each function has one x-intercept, which is a zero of the function. Divide the polynomial by the associated factor to obtain a quadratic factor. Then use the Quadratic Formula to obtain the other two (complex) zeros.