Question

ПЖ срочно помагите log5(x^2-2x-3) <или= 1

Answer 1

{x²-2x-3≤1⇒ x1+x2=2 U x1*x2=-3; x1=-1 U x2=3; -1≤x≤3
{x²-2x-3≤5⇒x²-2x-8≤0⇒x1+x2=2 U x1*x2=-8; x1=-2 U x2=4; -2≤x≤4
x∈[-1;3]