S0AL PAS NOMOR 9
ANGGUN INDAH X MIPA 3 9. Akar akar persamaan 3^2x+1-28.3^x+9=O adalah x1 dan x2.jika x1>,x2 maka nilai dari 3x1-x2 adalah.... 9). 3^2x+1 × 28 × 3^x + 9 = 0 (3^x)² × 3 - 28 × 3^x - 9 = 0 p² - 28p + 9 = 0 (3p - 27/3) (p-1) (p = 9) (p = 1/3) •> p = 9 → 3^x = 9 3^x = 3³ x = 3 •> p = 1/3 → 3^x = 1/3 3^x = 3^-1 x = -1 => 3 X1 - X2 3 (3) - (-1) = 7