3a²-ab²+7b²-21a = 0
b² = 3a+1
a = ...?
Penyelesaian:
3a²-ab²+7b²-21a = 0 [Masukkan nilai b²]
3a²-a(3a+1)+7(3a+1)-21a = 0
3a²-3a²-a+21a+7-21a = 0
-a+7 = 0
-a = -7
a = 7
Jawaban: C
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3a²-ab²+7b²-21a = 0
b² = 3a+1
a = ...?
Penyelesaian:
3a²-ab²+7b²-21a = 0 [Masukkan nilai b²]
3a²-a(3a+1)+7(3a+1)-21a = 0
3a²-3a²-a+21a+7-21a = 0
-a+7 = 0
-a = -7
a = 7
Jawaban: C