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f(-3)=2-3(-3)+1
f(-3)=18+9+1 = 28
jadi f(x)= 28 untuk x=-3
f(-3)= (2 x(-3kuadrat))-(3 x -3) + 1
= (2 x 9)-(-9)+1
= 18+9+1
= 28
2.Nomor 2 saya lupa maaf :)
Semoga Membantu :)