9у²- 12у+4=0 0,5n²-3n+4.5=0

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To factor the given quadratic equations, we can use the quadratic formula or complete the square method:

1) 9у² - 12у + 4 = 0
This quadratic equation can be factored as: (3у - 2)² = 0
Therefore, the solutions are y = 2/3 with a multiplicity of 2.

2) 0.5n² - 3n + 4.5 = 0
To factor this equation, we first multiple by 2 to remove the decimal: 1n² - 6n + 9 = 0
Now, this quadratic equation can be factored as: (n - 3)² = 0
Therefore, the solution is n = 3 with a multiplicity of 2.