Let's explore how to solve quadratic equations by looking at their graphs.

**TEKS Standards and Student Expectations**

**A(1) **Mathematical process standards. The student uses mathematical processes to acquire and demonstrate mathematical understanding. The student is expected to:

**A(1)(C)** select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems

**A(1)(D)** communicate mathematical ideas, reasoning, and their implications using multiple representations, including symbols, diagrams, graphs, and language as appropriate

**A(8) **Quadratic functions and equations. The student applies the mathematical process standards to solve, with and without technology, quadratic equations and evaluate the reasonableness of their solutions. The student formulates statistical relationships and evaluates their reasonableness based on real-world data. The student is expected to:

**A(8)(A)** solve quadratic equations having real solutions by factoring, taking square roots, completing the square, and applying the quadratic formula

**Resource Objective(s)**

Given a quadratic equation, the student will use graphical methods to solve the equation.

**Essential Questions**

How can you solve a quadratic equation by looking at the graph?

How do know how many solutions a quadratic equation has?

**Vocabulary**