Given - x + 3Y = 5, then the value of 5 (x-3y) 2-8 (x-3y) - 5 is () A. 80B. -170C. 160D. 60
∵ - x + 3Y = 5, ∵ x-3y = - 5, ∵ 5 (x-3y) 2-8 (x-3y) - 5 = 5 × (- 5) 2-8 × (- 5) - 5 = 125 + 40-5 = 160
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