1. y = (1/4)x⁴ + 5
f(-x) = (1/4)(-x)⁴ + 5 = (1/4)x⁴ + 5 = f(x)
→ Even
2. y = x³ + 3x - 5
f(-x) = (-x)³ + 3(-x) - 5 = -x³ - 3x - 5
f(-x) ≠ f(x) and f(-x) ≠ -f(x)
→ Neither
3. y = x³ + 3x
f(-x) = (-x)³ + 3(-x) = -x³ - 3x = -(x³ + 3x) = -f(x)
→ Odd
4. f(x) = (x⁴ + 4)/(x² + 2)
f(-x) = ((-x)⁴ + 4)/((-x)² + 2) = (x⁴ + 4)/(x² + 2) = f(x)
→ Even
5. f(x) = 1 - 2x⁶
f(-x) = 1 - 2(-x)⁶ = 1 - 2x⁶ = f(x)
→ Even
6. f(x) = (12x)/x
For x ≠ 0, f(x) = 12
f(-x) = 12 = f(x)
→ Even
Parent Tip: Review the logic above to help your child master the concept of even and odd functions worksheet.