18/8=4.5/f

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Solution for 18/8=4.5/f equation:


D( f )

f = 0

f = 0

f = 0

f in (-oo:0) U (0:+oo)

18/8 = 4.5/f // - 4.5/f

18/8-(4.5/f) = 0

18/8-4.5*f^-1 = 0

-4.5*f^-1 = -9/4 // : -4.5

f^-1 = 0.5

-1 < 0

1/(f^1) = 0.5 // * f^1

1 = 0.5*f^1 // : 0.5

2 = f^1

f = 2

f = 2

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