Ameer Alashi
Ученик
(179)
1 год назад
x²+5x=36:
x² + 5x - 36 = 0
(x + 9)(x - 4) = 0
x1 = -9, x2 = 4
(-5x+3)(-x+8)=0:
-5x + 3 = 0 или -x + 8 = 0
x1 = 3/5, x2 = 8
x-x/12=55/12:
11x/12 = 55/12
x = 5
7+5x-2x²=0:
2x² - 5x - 7 = 0
(2x + 7)(x - 1) = 0
x1 = -7/2, x2 = 1
(x+1)²+(x-6)²=2x²:
x² + 2x + 1 + x² - 12x + 36 = 2x²
2x² - 10x - 35 = 0
(x - 5)(2x + 7) = 0
x1 = 5, x2 = -7/2
x²-x-42=0:
(x - 7)(x + 6) = 0
x1 = 7, x2 = -6
(-5x+3)(-x+8)=0
x-x/12=55/12
7+5x-2x²=0
(x+1)²+(x-6)²=2x²
x²-x-42=0