Question

9² × 3² + 2² - 5² = ..
[tex] \\ \\ [/tex]
f(x) = ³log x + 90/x - x²
f(9) = ..​

Answer 1

Jawaban:

9² × 3² + 2² - 5² = ..

(3^2)^2 × 3^2 + (2×2) - (5×5)

3^(2×2) × 3^2 + 4 - 25

3^4 × 3^2 + 4 - 25

3^(4+2) + 4 - 25

3^6 + 4 - 25

729 + 4 - 25

733 - 25

= 708

f(x) = ³log x + 90/x - x²

f(9) = ..

penyelesaian :

³log 9 + 90/9 - 9^2

³log 3^2 + 10 - (9×9)

2. ³log 3 + 10 - 81

(2×1) + 10 - 81

2 + 10 - 81

12 - 81

= -69

Answer 2

No 1

9² × 3² + 2² - 5²

(9 × 3)² + (2 × 2) - (5 × 5)

27² + 4 - 25

(27 × 27) + 4 - 25

729 + 4 - 25

704 + 4

708

No 2

f(x) = ³log x + 90/x - x²

f(9) = ³log 9 + 90/9 - 9²

f(9) = log (3²) + (90 : 9)/(9 : 9) - (9 × 9)

f(9) = 2 + 10/1 - 81

f(9) = 2 + 10 - 81

f(9) = 12 - 81

f(9) = -69