Question

Помогите пожалуйста решить!

Answer 1

y-x=-5

x2-2xy-y2=17

 

y=x-5

x2-2x(x-5)-(x-5)2=17

 

x2-2x2+10x-x2+10x-25=17

-2x2+20x-42=0

D=400-336=64

x(1) = -20+8 / -4 = 3

x(2) = -20 - 8 / -4 = 7

 

y(1) = 3-5 = -2

y(2) = 7-5 = 2

Answer 2

y= x-5
x^2- 2x(x-5) - (x-5)^2=17 эти два в системе
x^2 - 2x^2 + 10x - x^2 + 10x - 25=17
-2x^2+20x-25-17=0 | /(-2)
x^2-10x+21=0
дискриминант = 100-84= 16
x1= 12, x2= 3
y1= 12-5=7 , y2= 3-5= - 2