Question

решит неравенства (x+2)(x-6)-(x-7)(x+7)<30-3x

Answer 1

$(x+2)(x-6)-(x-7)(x+7) textless 30-3x \x^2-6x+2x-12-(x^2-49) textless 30-3x \x^2-4x-12-x^2+49 textless 30-3x \37-4x textless 30-3x \4x-3x textgreater 37-30 \x textgreater 7 \x in (7;+infty)$
Ответ: $x in (7;+infty)$