1. (2x-3)(5x+2)≥ (2x-3)(3x-8)
(2x-3)(5x+2)- (2x-3)(3x-8)≥0
(2x-3)(5x+2-3x+8)≥0
(2x-3)(2x+10)≥.
x=1,5 x=-5
x∈(-∞;-5] U [1,5;∞)
2.x^2(x^2-16)≤ 9(x^2-16)
x^2(x^2-16)-9(x^2-16)
≤0
(x²-16)(x²-9)≤0
(x-4)(x+4)(x-3)(x+3)≤0
x=4 x=-4 x=3 x=-3
+ _ + _ +
---------[-4]-------------[-3]----------[3]---------[4]------------------
x∈[-4;-3] U [3;4]