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Verified answer
Bab Barisan dan DeretMatematika SMP Kelas VIII
geometri
U2² = U1 x U3
(a + 2)² = a (a + 6)
a² + 4a + 4 = a² + 6a
a² - a² + 4a - 6a = -4
-2a = -4
a = -4/-2
a = 2