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Jyqft
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If \[y=vx\] becomes \[y=vdx\], then what does \[y=vx^n\] become?
 2 years ago
 2 years ago
Jyqft Group Title
If \[y=vx\] becomes \[y=vdx\], then what does \[y=vx^n\] become?
 2 years ago
 2 years ago

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dpflan Group TitleBest ResponseYou've already chosen the best response.2
OK, I assume v is a constant?
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
OK then, the derivative of 'x' is a constant
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
like you so elegantly show. Now are you familiar with the power rule for derivatives?
 2 years ago

Jyqft Group TitleBest ResponseYou've already chosen the best response.0
Yeah. Derivative of \[x^n\] is \[nx^{n1}\ But in this case, how can I express that as d(something)?
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
\[n*x^{n1}\] Yeah, well, \[dx\] I think can just be looked at as a term for 'change in x'
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
so what you're actually doing is such: you take the derivative of something relative to something else, so you found that \[y=vx, y'=vdx\] which is \[dy = v * dx \]
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
so a change in y for a change in x for the original equation can be attributed to v * the change in the x value.
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
So, y=vx, say v = 2, now when x=2, y = 2*(2) = 4, then when x=3, y = 2*(3) = 6, so the difference in y is 6  4 =2, the difference in x is 32=1, so when x changed by 1 y changed by 2*the change in x
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
Now, for the more complex \[y = v * x^{n}\]
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
now, the change in y with respect to change in x is now time for the derivative
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
\[dy = v * (n)*(x^{n1}) * dx\] Use the power rule here
 2 years ago

Jyqft Group TitleBest ResponseYou've already chosen the best response.0
Thanks, that was wellexplained.
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
Nice, is it clear? The cool thing about math is understanding the symbols, but it is easy to let the symbols confuse yourself
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.2
so a change in y for a change in x for the original equation can be attributed to v * the change in the x value. That's the key concept for derivatives here, just then you have to find how x changes, and you used the power rule to find how x changes
 2 years ago
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