F(x) = x² - 81
Finding f⁻¹(x) the inverse function
Let y = f(x) and solve for x.
y = x² - 81
y + 81 = x²
x² = y + 81
x = √(y + 81)
Recall f(x) = y, that means x = f⁻¹(y)
x = √(y + 81)
f⁻¹(y) = √(y + 81)
Therefore f⁻¹(x) = √(x + 81)
Answer: x=-1
Step-by-step explanation:
- 3/4x+3-2x=-1/4+1/2x+5
- 3-5/4x=1/2x+19/4
- 7/4x=-7/4
- x=-1
The square root of 72 lies between 8 and 9
Answer:
20
Step-by-step explanation:

