## Find a function f such that f ‘(x) = 3×3 and the line 81x + y = 0 is tangent to the graph of f.

Find a function f such that f ‘(x) = 3x^3 and the line 81x + y = 0 is tangent to the graph of f. f(x) =? Please help me solve this apparently easy calculus question!! I Will be very thankful!! Thank you If f'(x) = 3x^3 then f(x) = (3/4)x^4 + c, for some … Read more