Diketahui a² – b² = 40 dan a – b = 4 berapakah nilai a + b?

A = 7 b = 3
7 pangkat dua = 49 3 pangkat 2 =9
49-9 = 40
7-3 = 4
7 +3 = 10

A² – b² = 40
a – b = 4
a= 4+b

a² – b² = 40
(4+b)² – b² = 40
16 +8b+b² – b² = 40
8b = 32
b=4

a = 4+4 = 8

nilai a+b = 8+4 = 12