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Verified answer
X+7 ≥ 0x ≥ -7
x-1 ≥ 0
x ≥ 1
x-3 ≥ 0
x ≥3
Verified answer
(x+7) × (x-1) × (x-3) ≥ 0= (x² - x + 7x - 7) × (x-3) ≥ 0
= (x² + 6x - 7) × (x-3) ≥ 0
= x³ - 3x² + 6x² - 18x - 7x + 21 ≥ 0
= x³ + 3x² - 25x + 21 ≥ 0
= x³ + 3x² - 25x ≥ 21