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(x-2)^2-2(x-2y)=1-(3-x)(3+x)
2x+y=4
x^2-4x+4-2x+4y=1-3^2+x^2
2x+y=4
x^2-4x-2x+4y-x^2 =1-9-4
2x+y=4
-6x+4y=-12
2x+y=4 /*3
-6x+4=-12
6x+3y=12
7y=0 /: 7
y=0
2x+0=4
y=0
2x=4 /:2
y=0
x=2
y=0
b)
(x+1)^2 +y^2-8=(y-2)^2+(x-3)(x+3)
3x-y+4=0
x^2+2x+1+y^2-8=y^2-4y+4+x^2-9
3x-y=-4
x^2+2x+y^2-y^2+4y-x^2=-9-1+8+4
3x-y=-4 /*4
2x+4y=2
12x-4y=-16
14x=-14 /:14
x=-1
2*(-1)+4y=2
x=-1
-2+4y=2
x=-1
4y=2+2
x=-1
x=-1
y=1
c)
(x-1)^2-(y-3)^2=(x-y)(x+y)
x+y/2-y+4/3=1 /*6
x^2-2x-y^2+6y-x^2+y^2=-1+9
3x+3y-2y-8=6
-2x+6y=8
3x+y=14 /: (-6)
-2x+6y=8
-18x-6y=-84
-20x=-80 /: (-20)
x=4
-2*4+6y=8
x=4
-8+6y=8
x=4
6y=8+8
x=4
6y=16 /:6
x=4
y=2 i 2/3
x=4
d)
(y+1)^2-x(4x+5)=(y+2x)(y-2x)
3x-y=1
y^2+2y+1-4x^2-5x=y^2-(2x)^2
3x-y=1
y^2+2y+1-4x^2-5x=y^2-4x^2
3x-y=1
2y-5x=-1
3x-y=1 /*2
2y-5x=-1
-2y+6x=2
x=1
-2y+6*1=2
x=1
-2y=2-6
x=1
x=1
y=2
e)
(x-3)^2-(x-5)(x+5)=2y+48
x+y/2 - x-y/4=3/4 /*4
x^2-6x+9-x^2+25=2y+48
2(x+y)-x-y=3
x^2-6x-x^2-2y=48-9-25
2x+2y-x-y=3
-6x-2y=14
x+y=3 /*2
-6x-2y=14
2x+2y=6
-4x=20/: (-4)
x=-5
2*(-5)+2y=6
x=-5
-10+2y=6
x=-5
2y=6+10
x=-5
x=-5
y=8
f)
(x+1)^2-2y-12=(x-3)(x+3)
3x-y=-4
x^2+2x+1-2y-12=x^2-9
3x-y=-4
x^2+2x-2y-x^2=-9-1+12
3x-y=-4
2x-2y=2
3x-y=-4 /*(-2)
2x-2y=2
-6x+2y=8
-4x=10 /: (-4)
x=2,5
2*2,5-2y=2
x=2,5
5-2y=2
x=2,5
-2y=2-5
x=2,5
x=2,5
y=1,5