Ответ:
#5
a) 4
b) 0
#6
a) -2 и 5/2
b) 0.5 и 2
Пошаговое объяснение:
a) (x+1)(x+2)=18+3x
x^2 + 3x + 2 = 18 + 3x
x^2 = 16
x = 4
b) (x-3)^2+(x+1)^2 = 10
x^2 - 6x +9 + x^2 +2x + 1 = 10
2x^2 - 4x = 0
x = 0
a) (x+1)(2x-3) = 7
2x^2 - 3x + 2x - 3 = 7
2x^2 -x = 10
x = -2
x = 5/2
b) x(3x-2) = (5x - 2)(x-1)
3x^2 - 2x = 5x^2 - 5x - 2x +2
-2x^2 + 5x = 2
x = 0.5
x = 2