1) 12x^2 - (4x-3)(3x+1) = -Раскроем скобки12x^2 - (12x^2 + 4x - 3x - 3) = -12x^2 - 12x^2 - x + 3 = --x + 3 = --x = -x = 5
2) (4x-3)(3+4x) - 2x(8x-1) = Раскроем скобки12x + 16x^2 - 9 - 12x^2 + 2x = 12x - 9 + 2x = 14x - 9 = 14x = x = 9/14
3) x + (5x+2)^2 = 25(1+x^2Раскроем квадратx + 25x^2 + 20x + 4 = 25 + 25x^Упростим20x + 4 = 220x = 2x = 21/20
1) 12x^2 - (4x-3)(3x+1) = -
Раскроем скобки
12x^2 - (12x^2 + 4x - 3x - 3) = -
12x^2 - 12x^2 - x + 3 = -
-x + 3 = -
-x = -
x = 5
2) (4x-3)(3+4x) - 2x(8x-1) =
Раскроем скобки
12x + 16x^2 - 9 - 12x^2 + 2x =
12x - 9 + 2x =
14x - 9 =
14x =
x = 9/14
3) x + (5x+2)^2 = 25(1+x^2
Раскроем квадрат
x + 25x^2 + 20x + 4 = 25 + 25x^
Упростим
20x + 4 = 2
20x = 2
x = 21/20