(6-х)в квадрате=121 (5х+1)в квадрате=400

( 6 - x)² = 121 ( 6 - x)( 6 - x) = 121 36 - 12x + x² - 121 = 0x² - 12x - 85 = 0D = b² - 4ac = ( - 12)² - 4 × 1 × ( - 85) = 144 + 340 = 484 = 22²x₁ = (12 + 22) / 2 = 17x₂ = (12 - 22) / 2 = - 5( 5x + 1)² = 400( 5x + 1)( 5x + 1) = 40025x² + 10x + 1 - 400 =025x² + 10x - 399 = 0D = b² - 4ac = 10² - 4 × 25 × ( - 399) = 100 + 3990 = 4090 x₁,₂ = - 10₊/₋√4090/ 50