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1 + 2ˣ + 2.2ˣ = y²
3.2ˣ = y²-1
2ˣ = (y²-1)/3
x = ²log ((y²-1)/3), y²-1>0, y> 1dan y < -1
misal x= 0, maka y= -2 dan y= 2
(0, -2), (0, 2)
2. koefisien x²⁰¹⁴ dari soal mengikuti deret segitiga pascal:
1+3+6+10+15+....u₂₀₁₄ = ∑ u(u+1)/2, dengan n=2014
∑ u(u+1)/2 = (1/2).(∑u² + ∑u)
= (1/2).((n(n+1)(2n+1)/6) + (n/2).(1+n))
= (1/2).((2014(2015)(4019)/6) + (2014/2).(1+2014))
= 1.360.176.718+ (1/3)
3. 2.2.1.2.2.1.2.2.1.2.2.1 = 2⁸ = 256
1.1.2.1.1.2.1.1.2.1.1.2 = 2⁴ = 16 (+)
272
4. tembak aja x=y=z, ntar dapet x=y=z= 33/10