求用十字相乘法解 2x^2-5x-12
问题描述:
求用十字相乘法解 2x^2-5x-12
答
2x^2-5x-12=﹙x-4﹚﹙2x+3﹚
答
2x^2-5x-12
=(2x+3)(x-4)