I know this is really basic why does $\displaystyle f(2)=-4{x}^{-1}$ equal $\displaystyle -2$ and not $\displaystyle -8$
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Originally Posted by Envy I know this is really basic why does $\displaystyle f(2)=-4{x}^{-1}$ equal $\displaystyle -2$ and not $\displaystyle -8$ Your question does not make any sense. Are you asking: If $\displaystyle f(x) = -4x^{-1}$ what does $\displaystyle f(2)$ equal? Let $\displaystyle x = 2$. You would have $\displaystyle f(2) = -4(2)^{-1}$ $\displaystyle = -4\left(\frac{1}{2}\right)$ $\displaystyle = -2$.
Substituting 2 into the equation -4 * ( 2 to the power of -1 ) 2 to the power of -1 is the same as 1 / 2 so -4 * 1/2 = -2 and not -8
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