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3)
ambil x = 1 maka f(5) = ²log(2.1³ - 1² + 7) = ²log8 = ²log 2³ = 3 jawaban C
4)
x1 > 1
x2 < 1
artinya pasti ada dua akar maka D > 0
D = b²-4ac = 4 - 4(c+2) > 0 maka 4-4c-8>0, 4c < -4
c< -1 jawaban A