(2x+5)(5-2x) + (2x-3)² - 2 > 0 10x - 4x² + 25 - 10x + 4x² - 12x + 9 - 2 > 0 -12x + 32 > 0 -12x > - 32 x < [latex] frac{32}{12} [/latex] x < [latex] frac{8}{3} [/latex] (x - [latex] frac{1}{2} [/latex])² - 4 < x - (2-x)(2+x) x² - x + [latex] frac{1}{4} [/latex] - 4 < x - (4 - x²) x² - x + [latex] frac{1}{4} [/latex] - 4 < x - 4 + x² -2x + [latex] frac{1}{4} [/latex] < 0 x > [latex] frac{1}{8} [/latex]
1)
(2x+5)(5-2x)+(2x-3)²-2>0
-4x²+25+(4x²-12x+9)-2>0
-4x²+25+4x²-12x+9-2>0
-12x+25+9-2>0
-12x+32>0
-12x>-32
x<[latex] frac{32}{12} [/latex]
x<[latex]2 frac{8}{12} [/latex]
x<[latex]2 frac{2}{3} [/latex]
x∈(-∞ ;[latex]2 frac{2}{3} [/latex])
b)
(x-[latex] frac{1}{2} [/latex])²-4