Question

Jika a² + b² = 5 dan a + b = 3, maka a - b =....

Answer 1

A = 1 atau 2
b = 1 atau 2

a - b = 2 - 1 = 1
a - b = 1 - 2 = -1

Answer 2

A+b = 3
a= 3-b

a² + b² = 5
(3 -b)² + b² = 5
9 - 6b +b² +b²= 5
2b² - 6b + 4 = 0
b² - 3b + 2= 0
(b-2) (b-1) = 0
b= 2  atau b= 1
angka nya 2 dan 1 
a= 2....b=1
a-b = 2-1= 1