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x²≥0
x≥0
b) 5/9 (x+13)(x+17)≥0 |*9
5(x²+17x+13x+221)≥0
5(x²+30x+221)≥0
5x²+150x+1105≥0
a ) 6x² ≥5x²
6x² - 5x² ≥ 0
x² ≥ 0
b) 5/9 (x+13)(x+17)≥0
5/9 (x² + 30x + 221) ≥0
5/9x² + 150/9x + 1105/9 ≥0
5/9x² + 144 i 6/9x + 122 i 7/9 ≥0
b)5/9(x+13)(x+17)≥0 ; x+13≥0 i x+17≥0 lub x+13≤0 i x+17≤0 ;
x≥-13 i x≥-17 lub x≤-13 i x≤-17
x∈<-13;+∞) x∈<-17;-∞ )