Question

Q.

f(x) = x! × 2x - x
____________

f(9) =.....

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Answer 1

f(x) = x! × 2x - x

f(9) = 9! × 2x - x

f(9) = (9.8.7.6.5.4.3.2.1) × (2 × 9) - 9

f(9) = 362.880 × 18 - 9

f(9) = 6.351.840 - 9

f(9) = 6.351.831

Answer 2

f(x) = x! × 2x - x

f(9) = 9! × 2(9) - 9

f(9) = ( 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1)× ( 2 × 9 )-9

f(9) = ( 72 × 7 × 6 × 5 × 4 × 3 × 2 × 1) × 18 - 9

f(9) = ( 504 × 6 × 5 × 4 × 3 × 2 × 1 ) × 18 - 9

f(9) = ( 3.024 × 5 × 4 × 3 × 2 × 1 ) × 18 - 9

f(9) = ( 15.120 × 4 × 3 × 2 × 1 ) × 18 - 9

f(9) = ( 60.480 × 3 × 2 × 1 ) × 18 - 9

f(9) = ( 181.440 × 2 × 1 ) × 18 - 9

f(9) = ( 362.880 × 1 ) × 18 - 9

f(9) = ( 362.880 × 18 ) - 19

f(9) = 6.531.840 - 9

f(9) = 6.531.831