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posted by jump Sunday, September 30, 2012 at 2:38pm.

determine any values of x for which a tangent line to the curve f(x)=1/x will have a slope of -4

if y = 1/x then dy/dx = -1/x^2 so -1/x^2 = -4 x^2 = 1/4 x = ± 1/√2

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