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a²+a+(1/2)² = 3+(1/2)²
(a+1/2)² = 3+1/4
= 13/4
a+1/2 = 1/2 √13 atau a+1/2 = - 1/2 √13
a = - 1/2 + 1/2 √13 atau a = -1/2 - 1/2√13
= - 1/2 (1-√13) atau a= - 1/2 (1+√13)
= -1/2 (-2,6) atau a = -1/2 (4,6)
= 1,3 a = - 2,3
Untuk a= 1,3
(1,3) ³+ 4(1,3)² + 9988 = 2,197 + 4.1,69 + 9988
= 2, 197 + 6,76 + 9988
= 8,957 + 9988
Untuk a = -2,3
(-2,3)³ + 4 (2,3)² + 9988 = - 12,167 + 4. 5,29 + 9988
= -12,167 + 21.16 + 9988
= 8,993 + 9988
= 9996,993
= 9997
sehingga yg terbesar = 9997