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Mathematics 17 Online
OpenStudy (anonymous):

helpp

OpenStudy (amistre64):

we need to make a smooth transition from the parts

OpenStudy (amistre64):

since they transition at x=3, what is the slope of the line at x=3?

OpenStudy (amistre64):

another way to look at this is: what is the equation of the tangent line of x^2, at x=3

OpenStudy (amistre64):

the slope of the line is defined by what?

OpenStudy (amistre64):

you are taking calculus classes ...

OpenStudy (amistre64):

how do we determine the slope of a line at a given point along a curve?

OpenStudy (amistre64):

we take the ____________ of the function.

OpenStudy (anonymous):

point idk

OpenStudy (amistre64):

it starts with deriv, and ends with ative

OpenStudy (amistre64):

the derivative of a function defines the slope of the function at any given point.

OpenStudy (amistre64):

:)

OpenStudy (amistre64):

hehe :) if we know the slope of a line, and a point in that line ..... we can construct a line equation.

OpenStudy (amistre64):

given a function f the slope at any given point, a, is equal to f'(a) and by using the point (a,f(a)) we can define a line as: y = f'(a) (x-a) + f(a)

OpenStudy (amistre64):

since f = x^2, what is f' ?

OpenStudy (amistre64):

then: y = 2a (x-a) + a^2 what is our value of a?

OpenStudy (amistre64):

well, in order for the parts to meet up, then they would have to be connected when x=3 yes. so let a=3 y = 2(3) (x-3) + 3^2 gives us the tangent line equation, which is simply what the y=mx+b is calling for.

OpenStudy (amistre64):

-18 + 9 = -9

OpenStudy (amistre64):

its rather humbling when we forget how to add when taking a calculus class ;)

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