Question

For which values of m is the equation always true.​

Answer 1

m∈(-∞;-2]∪[6;+∞).

Explanation:

1) Δ=b²-4ac, then

m²-4(m+3)≥0; ⇔m²-4m-12≥0; ⇔ (m-6)(m+2)≥0;

2) m∈(-∝;-2]∪[6;+∝).