Intro to Rates of Change - Grade 12.
I don't really get what my teachertaught? Can someone explain this step please??
He wrote
"Find the equation of the tangent to y = x^3 - 3x^2 - x +2 at x = 2.
y1 = 3x^2 - 6x -1 at x = 2.
Steps:
at x=2. m1 = 3(2)^2 - 6(2) - 1 = -1
(What??? m?? Where did that come from??)
y = 2^3 - 3(2)^2 - 2 + 3 = -3
y-y1 m(x-x1)
therefore y+3 = -1(x-2)
y = -x-1
Can someone please explain?

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Did he divide the two equations together? :s sorry im not sure

this is our very first lesson on rtes of change ever

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