b. find the equation of the tangent line to f at x = a. 11. f(x)=3-4x,...

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b. find the equation of the tangent line to f at x = a. 11. f(x)=3-4x, a = 2 12. f(x) = +6, a = -1 13. f(x) = x² + x, a = 1 14. f(x) = 1-x-x², a = 0 15. f(x) = 7, a = 3 b. find the equation of the tangent line to f at x = a. 11. f(x)=3-4x, a = 2 12. f(x) = +6, a = -1 13. f(x) = x² + x, a = 1 14. f(x) = 1-x-x², a = 0 15. f(x) = 7, a = 3