-x^2-4x+5>=0. плиз СРОЧНО

Question

-x^2-4x+5>=0. плиз СРОЧНО

Answer 1

-x^2 -4x + 5 = 0
x^2 +4x - 5 = 0
 
x1 + x2 = -4
x1*x2 = -5

x1 =-5
x2 = 1

___--_____-5____+_____1____---_____

-5 <= x <= 1<br>

Answer 2

-x^2-4x+5=0
D=16+20=36
x1=4+6\-2=-5
x2=4-6\-2=1
x∈(-∞;-5]∪[1;+∞)