Answer:
Option A:{x/ x∈R}
Step-by-step explanation:
The given quadratic inequality is f(x)≤0.
Replacing f(x) by y we have: y≤0.
y=0 on the x axis .Any quadratic equation represents a parabola.
The solution to the inequality will either be "all x" or "no x" it depends on the side of the axis the parabola will lie.
As the quadratic inequality is f(x)≤0 so the graph will be below the x axis and the solution set will be the set of real numbers.
Solution of the quadratic inequality is Option A:{x/ x∈R}.
