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Bab EksponensialMatematika SMP Kelas IX
3] f(x) = ⁴√((1/9)⁻ˣ⁺¹)
(a, 9)
9 = (1/9)^((-a + 1)/4)
3² = (3⁻²)^((-a + 1)/4)
2 = (2a - 2)/4
2a - 2 = 2 . 4
2a = 8 + 2
a = 10/2
a = 5
jawabannya E
4] f(x) = 6ˣ⁺¹ + 6¹⁻ˣ, memotong sumbu y, maka x = 0
y = 6⁰⁺¹ + 6¹⁻⁰
y = 6 + 6
y = 12
(0, 12)
jawabannya A
5] 2ˣ = a
f(x) / g(x) = (2²ˣ + 2ˣ⁺¹ - 3) / (2ˣ + 3)
= (a² + 2a - 3) / (a + 3)
= (a + 3) (a - 1) / (a + 3)
= a - 1
= 2ˣ - 1
jawabannya D