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7^2 - 3^2
sehingga
a-b
=7-3
=4
a+b
=10
kalau aku sih pake logika aja,
pake logika jauh lebih cepat dibanding pake rumus
(a+b)(a-b) = 40 -----> subtitusikan a-b = 4
(a+b) 4 = 40
a+b = 40/4
a+ b = 10
Jadi nilai a+b adalah 10.