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=16+16-1
=31
F(2)=2Kuadrat+4.2-1
=4+8-1
=11
f(2) = (2)² + 4(2) - 1
= 4 + 8 - 1
= 12 - 1
= 11
f(4) = (4)² + 4(4) - 1
= 16 + 16 - 1
= 32 - 1
= 31