{a²+b²=10 (a+b)²-2ab=10 (a-b)²+2ab=10
{ab=-3͏ ͏ ͏ ͏ ͏ ͏ ͏ (a+b)²-2×(-3)=10 (a-b)²+2×(-3)=10
(a+b)²+6=10 (a-b)²-6=10
(a+b)²=10-6 (a-b)²=10+6
(a+b)²=4 (a-b)²=16
{a+b=2 {a-b=4
{a+b=-2 {a-b=-4
{a+b=2 {a+b=-2
{a-b=4 {a-b=-4
a=2-b a=-2-b
2-b-b=4 -2-b-b=-4
-2b=4-2 -2b=-4+2
-2b=2 -2b=-2
b=-1 b=1 {a=3
a=2-(-1) a=-2-(1) {b=-1
a=2+1 a=-2-1
a=3 a=-3 {a=-3
{b=1
{a²+b²=10 (a+b)²-2ab=10 (a-b)²+2ab=10
{ab=-3͏ ͏ ͏ ͏ ͏ ͏ ͏ (a+b)²-2×(-3)=10 (a-b)²+2×(-3)=10
(a+b)²+6=10 (a-b)²-6=10
(a+b)²=10-6 (a-b)²=10+6
(a+b)²=4 (a-b)²=16
{a+b=2 {a-b=4
{a+b=-2 {a-b=-4
{a+b=2 {a+b=-2
{a-b=4 {a-b=-4
a=2-b a=-2-b
2-b-b=4 -2-b-b=-4
-2b=4-2 -2b=-4+2
-2b=2 -2b=-2
b=-1 b=1 {a=3
a=2-(-1) a=-2-(1) {b=-1
a=2+1 a=-2-1
a=3 a=-3 {a=-3
{b=1