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f(x) = x² × x! + x(3) - x²

f(4) = 4² × 4! + 4(3) - 4²

= (4.4) × (4.3.2.1) + (4.3) - (4.4)

= 16 × 24 + 12 - 16

= 384 + 12 - 6

= 396 - 6

= 390

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Jawaban

f(4) = 4.4 × 4.3.2.1 + 4(3) - 4.4

f(4) = 16 × 24 + 12 - 16

f(4) = 384 + 12 - 16

f(4) = 396 - 16

f(4) = 380

x = 4

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