Practice problem
What is the set of solutions to the following quadratic inequality? 5x2+21≤x2+16x+55x^2 + 21 \le x^2 + 16x + 55x2+21≤x2+16x+5
[−4,4][-4, 4][−4,4]
[2,∞)[2, \infty)[2,∞)
(−∞,2](-\infty, 2](−∞,2]
{2}\{2\}{2}
[−2,2][-2, 2][−2,2]
Type a concept, like “slope” or “photosynthesis”.