Or you could go all the way back and use the limit definition of a derivative, but that's a little lengthy (but not difficult for this problem), so I'll omit that.
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The easiest way to do it is to multiply it out first and then take the derivative.
G(x) = (x - 1)(x - 3) = x^2 - 4x + 3
G ' (x) = 2x - 4
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Or you could use the Differentiation Chain Rule :
G ' (x) = (x - 1)*(d/dx)(x - 3) + (x - 3)*(d/dx)(x - 1) = (x - 1) + (x - 3) = 2x - 4
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Or you could go all the way back and use the limit definition of a derivative, but that's a little lengthy (but not difficult for this problem), so I'll omit that.
The gist of the communicate available (sorry, there are too many pages to furnish each and every of the hyperlinks) is that wands help to concentration the magic resident interior the witch or wizard, yet wandless magic remains achievable, extremely for terribly gifted human beings like Snape and Dumbledore. some examples ... Apparition Assuming one's Animagus type (or Metamorphpagus) Accio (the Summoning charm) Elves can do magic with out using wands Lumos