Jawaban:
34
Penjelasan dengan langkah-langkah:
x(x+2)=399
x²+2x-399=0
(x-19)(x+21)=0
x=19
x=15
19+15=34
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Jawaban:
34
Penjelasan dengan langkah-langkah:
x(x+2)=399
x²+2x-399=0
(x-19)(x+21)=0
x=19
x=15
19+15=34