Question

188, пожалуйста срочно спасибо

Answer 1

наверное,так. Саубол чтоли

Answer 2

Да, у вас ошибки во 2 и 4 примерах
обратите внимание на возведение в квадрат

Answer 3

$1) (y-2)(y+3)-(y-2) ^{2} leq 6y-11 \ y ^{2} +3y-2y-6-(y ^{2} +4-4y) leq 6y-11 \ y ^{2} +y-6-y ^{2} -4+4y leq 6y-11 \ y-10 leq 6y-11 \ y-6y leq -11+10 \ -5y leq -1 \ 5y geq 1 \ y geq 0.2 \ yin[0.2;+ infty} )$


$2) (y+3)(y-9)-(y+4) ^{2} geq 5-13y \ y ^{2} -9y+3y-27-(y ^{2} +16+8y) geq 5-13y \ y ^{2} -6y-27-y ^{2} -16-8y geq 5-13y \ -14y-43 geq 5-13y \ -14y+13y geq 5+43 \ -y geq 48 \ y leq 48 \ yin [- infty} ;48]$

$3) (3x+2) ^{2} -(4-3x) ^{2} textless 37x+14 \ 9 x^{2} +4+12x-(16+9 x^{2} -24x) textless 37x+14 \ 9 x^{2} +4+12x-16-9 x^{2} +24x textless 37x+14 \ 36x-12 textless 37x+14 \ 36x-37x textless 14+12 \ -x textless 26 \ x textgreater 26 \ xin(26;+ infty} )$


$4) (5x-2) ^{2} -15 textgreater (4x-1) ^{2} +9 x^{2} \ 25 x^{2} +4-20x-15 textgreater 16 x^{2} +1-8x+9 x^{2} \ 25 x^{2} -20x-11 textgreater 25 x^{2} -8x+1 \ 25 x^{2} -20x-25 x^{2} \ -12x textgreater 12 \ -x textgreater 1 \ x textless -1 \ xin(- infty} ;-1)$