Test Unit #9 & 10 Algebra 1 Semester

Front

What is a line of best fit used for?

Back

To make predictions.

Front

Identify the vertex from the table, THEN determine the range. What is the vertex and range for f(x) = -1,2?

Back

Vertex: (-1,2), Range: f(x) ≤ 2.

Front

Find the best fitting quadratic model for the data given: y = 1.2x² + 13x + 504.3, y = 12x² + 13x + 504.3, y = .12x² + 1.3x + 504.3. Which is correct?

Back

y = 1.2x² + 13x + 504.3.

Front

Using the curve of best fit, what would be the output (y) when the input (x) is 7?

Back

260.

Front

Use the quadratic formula to find the solutions for y = -x² - 5x + 12. What are the solutions?

Back

x = 2, x = -6.

Front

What is the quadratic formula?

Back

x = (-b ± √(b² - 4ac)) / (2a).

Front

What does the vertex of a parabola represent?

Back

The highest or lowest point of the parabola.

Front

What is the significance of the discriminant in a quadratic equation?

Back

It determines the nature of the roots: positive (two real solutions), zero (one real solution), negative (no real solutions).

Front

How do you determine the range of a quadratic function?

Back

By finding the vertex and identifying the direction the parabola opens.

Front

What is a quadratic function?

Back

A function that can be expressed in the form f(x) = ax² + bx + c, where a ≠ 0.