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2x²+8x+4-2x²+4√2x+4≥0
4√2x+8x+8≥0 /:4
(√2+2)x≥−2
x≥ -2/√2+2
x≥√2-2
b)-9(4-4x+x²) −1+9ײ≤11
−36+36x−9x²-1+9x²≤11
36x≤48
x≤4/3