tolong kerjakan pakai cara kerja.

7. x(x+5)≤12x-10
= x² + 5x ≤ 12x -10
= x² + 5x - 12x + 10 ≤ 0
= x² - 7x + 10 ≤ 0
= (x - 5) (x - 2) ≤ 0
= x ≤ 5 ∨ x ≤ 2
= { x I 2 ≤ x ≤ 5 }
smoga membantu