4.7A Complete the Square Algebra II.

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Presentation transcript:

4.7A Complete the Square Algebra II

What is completing the square used for? Completing the square is used for all those not factorable problems!! It is used to solve these equations for the variable.

Rule for Completing the Square Please note: a=1 This is now a PST! So, it factors into this!

Example 1: Find the value of c that makes this a PST, then write the expression as the square of a binomial. x2-3x+c b=-3

Example 2: Solve by completing the square. x2+6x-8=0 Don’t forget: Whatever you add to one side of an equation, you MUST add to the other side!

Examples 3.) 5x2-10x+30=0 x2-2x+6=0 x2-2x=-6 x2-2x+__=-6+__

4-7B Writing Quadratic Functions into Vertex form

Example 1 Write the quadratic function y=x2+6x+16 in vertex form Example 1 Write the quadratic function y=x2+6x+16 in vertex form. What is the vertex of the function’s graph? y=x2+6x+16 y-16=x2+6x y-16+__=x2+6x+__ y-16+9=x2+6x+9 y-7=(x+3)2 y=(x+3)2+7 If the equation, in vertex form, is y=(x+3)2+7, then the vertex must be (-3,7).

Example 2 Write the quadratic function y= 3x² - 6x -15 in vertex form. What is the vertex of the function’s graph?

Assignment