Solving Quadratic Inequality: y = x² + 2x + 2 < 0

Question

Look at the following function:

y=x2+2x+2 y=x^2+2x+2

Determine for which values of x x the following is true:

f(x) < 0

Step-by-Step Solution

To solve this problem, we need to rewrite the quadratic function y=x2+2x+2 y = x^2 + 2x + 2 into its vertex form. This process allows us to find the vertex and understand the behavior of the function.

First, we complete the square for the quadratic expression. Starting with:
y=x2+2x+2 y = x^2 + 2x + 2

We take the x x -terms x2+2x x^2 + 2x and complete the square as follows:

  • Take half of the coefficient of x x , which is 2, resulting in 1.
  • Square this value to get 1.
  • Add and subtract this square inside the equation to maintain equality.

Therefore, x2+2x+11+2 x^2 + 2x + 1 - 1 + 2 can be rewritten as:
y=(x+1)2+1 y = (x+1)^2 + 1

Now, the function is in the form y=(x+1)2+1 y = (x+1)^2 + 1 , which shows the vertex at (1,1) (-1, 1) . The vertex is the minimum point because the parabola opens upwards (as the coefficient of x2 x^2 is positive).

This vertex indicates that the minimum value of y y is 1, which means the function never reaches below zero. As a result, the function never assumes negative values.

Based on this analysis, we conclude that the function has no negative values.

The correct answer is therefore: The function has no negative values.

Answer

The function has no negative values.