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12. 
√√√x = 2 --> x⁽¹/²⁾^³= 2
x¹/⁸ = 2 --> x = 2⁸
∛y = 2 --> y = 2³
x/y = 2⁸⁻³ = 2⁵ = 32

13.
(x+3)(x + 5) - (x-4)(x-2)= 0
x² +8x + 15 - (x² -6x+8) = 0
x² +8x +15 -x² +6x - 8 =0
14x + 7= 0
x = 7/14
x = 1/2

14.
x< y ---. kalikan (-1)
-x > - y  atau -y < - x

15.
a> 1
aᵇ a⁴ = (a⁴)³. `
aᵇ⁺⁴ = a¹²
b+4 = 12
b = 8