castielwife4394 castielwife4394 24-10-2018 Mathematics contestada Simplify the polynomial expression. 3x(-2x+7)-5(x-1)(4x-3) A. 14x^2-14x+15 B. -26x^2+21x-15 C. -26x^2+56x-15 D. -2x^2+14x-2