Question

Помогите решить неравенство
-5x2-1/2 <-4 

Answer 1

$displaystyle frac{-5x^2-1}{2} <-4~~|cdot (-2)\ \ 5x^2+1>8\ 5x^2>7\ |x|>sqrt{frac{7}{5}} ~~~Rightarrow~~~left[begin{array}{ccc}x>sqrt{frac{7}{5}} \ x<-sqrt{frac{7}{5}} end{array}right$