78x + x³ × 5x² = ?
x = 7
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Q.
101.388
Penjelasan dengan langkah-langkah:
Diketahui:
- x = 7
Ditanya:
- 78x + x³ × 5x² =…?
Jawab:
- = 78x + x³ × 5x²
- = 78(7) + 7³ × 5(7)²
- = 78(7) + 7³ × 5(7.7)
- = 78(7) + 7³ × 6(49)
- = 78(7) + 7³ × (6.49)
- = 78(7) + 7³ × 294
- = 78(7) + (7.7.7) × 294
- = 78(7) + (7.49) × 294
- = 78(7) + 343 × 294
- = (78.7) + 343 × 294
- = 546 + 343 × 294
- = 546 + (343 × 294)
- = 546 + 100.842
- = 101.388
Kesimpulan:
Jadi, hasilnya adalah 101.388
SOAL 1
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78x + x³ × 5x²
x → 7
___________________________________________ 78(7) + 7³ × 5(7²)
= (78.7) + (7.7.7) × 5(7.7)
= (78.7) + (7.7.7) × 5(49)
= (78.7) + (7.7.7) × (5.49)
= (78.7) + (49.7) × (6.49)
= 546 + 343 × 294
= 546 + 100.842
= 101.388
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