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Can you use calculus?

What do you get for y'(x) in general?

i get 2x -8...

More specifically, y'(x) gives you the 'slope' of the tangent at x.

so after that if i get the value of m,, should i substitute the (3,-6) again tu find c?

so, it share the same value of x? right?

|dw:1356835091005:dw|

ok i understand now...thanks for your explanation....

but i little bit confuse,, how do u know the shape of graph was perpendicular?

ok i understand..thank u,, :)