Mathematics · Polynomial Functions · Topic 3 · 3 of 18
Evaluating Polynomial Functions
Substitute values and calculate the output of a polynomial function.
If f(x)=2x³−3x+1, then f(2)=?
Substitution process
- Replace every x with the given input value.
- Use parentheses, especially for negative inputs.
- Evaluate exponents first.
- Multiply, then add or subtract.
Solution: f(2)=2 × (2)³−3 × (2)+1=11.
InputThe chosen x-value.
OutputThe resulting value f(x).
Point on graphEvery result creates the point (x,f(x)).