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(a² + a)(a + 2) = 990
a³ + 2a² + a² + 2a = 990
a³ + 3a² + 2a = 990
Tanteando:
a = 9
9³ + 3(9)² + 2(9) = 990
Piden: √(a + 7) = √(9 + 7) = √16 = 4