The range of x² + 2x + 3 over real x is
A[3, ∞)
B(2, ∞)
C[2, ∞)
D(−∞, 2]
Answer & Solution
Correct answer: C. [2, ∞)
Writing it as (x + 1)² + 2 shows the minimum value is 2, with no upper bound.
Related questions
For x² − 6x + 5 = 0 the numerical value of |α − β| isWhich is a factorisation of 6x² + x − 2?Factoring x² + 7x + 12 = 0 by inspection gives rootsCircle, ellipse, parabola and hyperbola equations are quadratic inProblems solvable by quadratic equations were known as early asThe word quadratic comes from a Latin word meaningThe reduced form of 2x² + 6x + 4 = 0 isDividing a quadratic by a gives a reduced form with leading coefficient