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(2x-1)(2x+2)-(4x+5)²=-4x-2
4x² + 2x - 2 -(16x² + 40x + 25) = -4x -2
4x² + 2x - 2 -16x² - 40x - 25 = -4x -2
-12x² -38x - 27 = -4x -2
-12x² -34x - 25 = 0
Δ = 1156 - 4 * (-12) * (-25) = 1156 - 1200 = 44
Δ= √44
x = - (34 + √44/ 24)
x = -(34 - √44/24)
4*(4x-2/3)-2<6-5x/3
16x - 8/ 3 - 2 < 6-5x/3
21x - 14 / 3 - 2 < 0 /*3
21x - 14 - 6 < 0
21x - 20 < 0
21x < 20/:21
x < 20/21
4x² + 2x - 2 -(16x² + 40x + 25) = -4x -2
4x² + 2x - 2 -16x² - 40x - 25 +4x+2= 0
-12x² -38x - 27+4x+2 =0
-12x² -34x - 25 = 0
delta = 1156 - 4*(-12)*(-25) =
1156 - 1200 = 44
delta= √44
x1 = - (34 + √44/ 24)
x2 = -(34 - √44/24)
4*(4x-2/3)-2<6-5x /3
16x - 8/ 3 - 2 < 6-5x /3
21x - 14 / 3 - 2 < 0 /*3
21x - 14 - 6 < 0
21x - 20 < 0
21x < 20
x < 20/21