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Let f(x) = a(7-x^2) where a is not equal 0
(a) find, in terms of a, the equation of the line tangent to the curve at x = -1 (use point slope)
(b) find, in terms of a, the y intercept of the tangent line at x = -1
(c) find the x intercept of the tangent line at x=-1

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