Предмет: Математика, автор: danilaborisov99

решите неравенство х*2+4х+3<=0

Ответы

Автор ответа: yanaaleksandrov

х^2+4х+3<=0
x^2+4x+3=0
D=4^2-4*1*3=4
x1=(-4+2)/2= -1
x2=(-4-2)/2= -3
коэффициент а =1(>0). ветви параболы направлены вверх
поэтому -3<=x<= -1
ответ х∈[-3;-1] концы интервала включены

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