Question

x в квадрате +4х-12 меньше 5х

Answer 1

$x^{2} +4x-12 textless 5x \ x^{2} +4x-5x-12 textless 0\ x^{2} -x-12 textless 0 \ x^{2} -x-12=0 \ D=1+48=49 \ sqrt{D} =7 \ x_{1} = frac{1+7}{2} = frac{8}{2} =4 \ x_{2} = frac{1-7}{2} =- frac{6}{2} =-3 \ \ \ xin (-3;4)$