proszę o rozwiązanie tych zadań. ;) 5(x + 7)² - 5x² = 105 (x + 5)² - (x + 3)(x - 3) + 56 = -30 (x - 3)² > (x - 1)(x + 2) +4 (x - 4)(x + 4) - x² < 2(x - 3) 7(6x - 1) -2(x + 3)² ≤ 3(x +2)² - 5(x - 1)²

5(x + 7)² - 5x² = 105 (5x+35)² - 5x² = 105 5x² + 2*5x*35+14 - 5x²=105 5x² +350x- 5x²=105 350x=105/350 x=0,3 (x + 5)² - (x + 3)(x - 3) + 56 = -30 x²+2*x*5+5²+25-x²-3³+56=-30 x²+10x+25-x²-9+56=-30 10x=-30-56+9-25 10x=-102/10 x=-10,2

5(x + 7)² - 5x² = 105 5(x2 +49 +14x) - 5x2= 105 5x2 + 245 +70x -5x2= 105 70x=-140 x= -2 (x + 5)² - (x + 3)(x - 3) + 56 = -30 (x2+25+10x) - (x2-9) +56= -30 x2+25+10x -x2 +9 +56= -30 10x= -30 - 90 x=12 (x - 3)² > (x - 1)(x + 2) +4 (x2 +9-6x) > x2 - 2x -1+2 +4 -6x+2x> 5-9 -4x>-4 x<1 (x - 4)(x + 4) - x² < 2(x - 3) (x2 -16)-x2<2x-6 -16<2x-6 -10<2x x>-5 7(6x - 1) -2(x + 3)² ≤ 3(x +2)² - 5(x - 1)² (42x-7)-2(x2 +9+6x)≤ 3(x2+4+4x)-5(x2+1-2x) 42x-7 -2x2-18-12x≤ 3x2+12+12x-5x2-5+10x 42x -12x -22x≤ 12-5 +7+18 8x≤ 32 x≤4