Given - x + 2Y = 5, then the value of 5 (x-2y) 2-3 (x-2y) - 60 is______ .

Given - x + 2Y = 5, then the value of 5 (x-2y) 2-3 (x-2y) - 60 is______ .

∵ - x + 2Y = 5, ∵ x-2y = - 5, ∵ 5 (x-2y) 2-3 (x-2y) - 60 = 5 × (- 5) 2-3 × (- 5) - 60 = 125 + 15-60 = 80