468 Example 7.35. Apply Lagrange's formula inversely to obtain a root of the equation f(x) = 0, given that f(30) = -30, f/34) = -13, (38) = 3, and f'(42) = 18. Sal TV 468 Example 7.35. Apply Lagrange's formula inversely to obtain a root of the equation f(x) = 0, given that f(30) = -30, f/34) = -13, (38) = 3, and f'(42) = 18. Sal TV