Find an equation of the line tangent to the graph

[From: ] [author: ] [Date: 11-09-15] [Hit: ]

y = 1 - 2x - 9x^2 at the point ( -2, -31)

derivative of y is -18x-2
use point-slope equation.
y-y1=m(x-x1)
y+31 = 34(x+2)
y = 34x + 37

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