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9x²-12x + 4 ≤ x²-4x+4
9x²- x²-12x + 4x + 4 - 4 ≤ 0
8x² - 8x ≤ 0
x(8x-8)
x = 0
x2 = 1
+++ -- +++
--------------------------------
0 1
0≤ x≤ 1