(х+2)(х-6)-(х-7)(х+7)<30-3х

Question

(х+2)(х-6)-(х-7)(х+7)<30-3х

Answer 1

X^2 - 4x - 12 - (x^2 - 49) < - 3x + 30
x^2 - 4x - 12 - x^2 + 49 < - 3x + 30
- 4x + 37 < - 3x + 30
- 4x + 3x < 30 - 37
- x < - 7 
x >  7

x ∈ ( 7; + ∞)