Posted by George A.J on Monday, January 31, 2011 at 11:22pm.
Find the slope m of the tangent line to the graph of the function at the given point and determine an equation of the tangent line.
f(x) = 7 x  2 x^2 text( at ) \(1,9\)
m =
y =

Calculus  Damon, Tuesday, February 1, 2011 at 10:10am
dy/dx = 7  4x
at (1,9)
dy/dx = m = 7  4(1) = 11
plug in point
9 = 11 (1) + b
9 = 11 + b
b = 2

Calculus  drwls, Tuesday, February 1, 2011 at 10:12am
For the slope, calculate df/dx at x = 1.
m = df/dx = 7  14x = 21
y = 21x + b
9 = 21 + b
b = 12
y = 21x +12
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