1. f(x) = 3x + 2; g(x) = x²
- f(g(x)) = f(x²) = 3x² + 2
- g(f(x)) = g(3x + 2) = (3x + 2)² = 9x² + 12x + 4
2. f(x) = 5x - 1; g(x) = x² - 1
- f(g(x)) = f(x² - 1) = 5(x² - 1) - 1 = 5x² - 5 - 1 = 5x² - 6
- g(f(x)) = g(5x - 1) = (5x - 1)² - 1 = 25x² - 10x + 1 - 1 = 25x² - 10x
3. f(x) = √x; g(x) = 2x - 3
- f(g(x)) = f(2x - 3) = √(2x - 3)
- g(f(x)) = g(√x) = 2√x - 3
4. f(x) = 1/x; g(x) = x + 2
- f(g(x)) = f(x + 2) = 1/(x + 2)
- g(f(x)) = g(1/x) = 1/x + 2
5. f(x) = 2x + 1; g(x) = 3x - 2
- f(g(x)) = f(3x - 2) = 2(3x - 2) + 1 = 6x - 4 + 1 = 6x - 3
- g(f(x)) = g(2x + 1) = 3(2x + 1) - 2 = 6x + 3 - 2 = 6x + 1
6. f(x) = x² + 2x; g(x) = x - 1
- f(g(x)) = f(x - 1) = (x - 1)² + 2(x - 1) = x² - 2x + 1 + 2x - 2 = x² - 1
- g(f(x)) = g(x² + 2x) = (x² + 2x) - 1 = x² + 2x - 1
Parent Tip: Review the logic above to help your child master the concept of inverse relations and functions worksheet.