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log x 7 = -1/2
x⁻¹/² = 7
1/x¹/² = 7
1/√x = 7
7√x = 1
√x = 1/7
x = (1/7)²
x = 1/49
b)
log x 5 = -2
x⁻² = 5
1/x² = 5
5x² = 1
x² = 1/5
x = √(1/5) ∨ -√(1/5)
x = √5/5 ∨ -√5/5
c)
log x 0,0001 = -8
x⁻⁸ = 0,0001
1/x⁸ = 1/10000
x⁸ = 10000
(x²)⁴ = 10⁴
x² = 10
x = √10 ∨ -√10