If f(x)=x2−6x+5f(x) = x^2 - 6x + 5f(x)=x2−6x+5, find the range of xxx such that f(x)≤−3f(x) \leq -3f(x)≤−3.
x=3x = 3x=3
2≤x≤42 \leq x \leq 42≤x≤4
x≤2x \leq 2x≤2 or x≥4x \geq 4x≥4
No solution