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Greatest Binomial Coefficients

If fx = x3 ...

Question

If $f (x) = x^{3} - 3$ and $g (x) = 7 x^{5}$ , what is the approximate value of $f (g (3.9))$ ?

389.23

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938.32

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4261.48

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11086.57

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14257.91

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Solution

The correct option is B $389.23$
$f (x) = x^{3} - 3; g (x) = 7 x^{5}$
$f (g (3.9))$
$g (3.9) = 7 (3.9)^{5}$
$g (3.9) = 6315.69393$
$f (6315.69393) = 389.23$
The correct option is 'A'

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