2(x-3)(x+5)-(2x+1)(x+7)≤4
问题描述:
2(x-3)(x+5)-(2x+1)(x+7)≤4
答
2(x-3)(x+5)-(2x+1)(x+7)≤4
2(x^2+2x-15)-(2x^2+8x+7)≤4
-4x-37≤4
x≥-41/4