Determine the equation of the tangent to each curve at the indicated value. a. f(x) = -4.9t2 , t = 3.5 b. f(x) = (x2 – 3)(x2 1) , x = -4 c. h(x) = (x4 4)(2x2 – 6) , x = -1 d. y = 1 3 , x = -2