Question

Find the product of (2×^-3 - 3x^2) (5x^2 - x^3) and verify ur result for x=-1

Answer 1

$(2{x}^{3} - 3 {x}^{2} )(5 {x}^{2} - {x}^{3} ) \\ 10 {x}^{5 } - 2 {x}^{6} - 15 {x}^{4} + 3 {x}^{5 } \\ 13 {x}^{5} - 2 {x}^{6} - 15 {x}^{4 } \\ 13 \times {1}^{5} - 2 \times {1}^{6 } - 15 \times {1}^{4} \\ 13 - 2 - 15 \\ 13 - 17 \\ = - 4$