Bellwork 1)Write in standard form. 2) 3)A student is solving an equation by completing the square. Write the step in the solution that appears just before.

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Presentation transcript:

Bellwork 1)Write in standard form. 2) 3)A student is solving an equation by completing the square. Write the step in the solution that appears just before

Lesson 4.8 Solve ax 2 + bx + c = 0 using Quadratic Formula

Objective Solve quadratic equations using quadratic formula

Standard Students solve and graph quadratic equations by factoring, completing the square, or using the quadratic formula. Students apply these techniques in solving word problems. They also solve quadratic equations in the complex number system.

Academic Language Quadratic Formula Discriminant

Think/Pair/Share What is the quadratic formula? Why use the quadratic formula?

What is the general formula for a quadratic equation? Can you solve all quadratic equations for x when y = 0?

Complete the square

Practice

Discriminant

More practice

Homework p.296 #1, 2, 9, 11, 19, 21, 29, 31, 39, 41