x² - 5x - 1 = 0x² - 1 = 5xx - 1/x = 5x² +x + 1/x² - 1/x= (x²+ 1/x²) + (x - 1/x)= (x - 1/x)²+2 +(x - 1/x)= 5²+2+5= 32(x + 1/x)²= (x - 1/x)² + 4= 29x + ...