re answer this question the correct way. i did the question correctly but got the wrong answer. please help :)

6. Determine the equation of the tangent to the graph of f (x) = (x3 + 3x3 ) (-4x2 + 5) at x =8. (5 marks) fixigexi + fox ) gic x) 13 31x + (5-4 x2 ) - 8 (x35 x 3 + 3 JX Sub 8 = x f (8 ) = - 446 /Y= - 2510 M 2 - 446 4 = ( - 446) (8 ) + b - 2510 = (- 446 ) 10) + - 2 510 = ( - 446 ) ( 8 ) + 6 = 1058 Page 3 of 4