Question

(х-1)(х+1)/2 —21х/3>=(х—1)²/2

Answer 1

3x^2-1-42x/6>x^2-2x-1/2
3x^2-1-42x/6-x^2-2x-1/2>0
-10x-4/6>0
-10x-4>0
-10x>4
x>-0,4