Graphing Quadratics (Parabolas) - Cool math Algebra Help Lessons

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Coolmath Algebra
Graphing Quadratics Lesson 8 - Completing the Square (page 2 of 4)
---- This algebra lesson explains how to complete the square.

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STEP 3:

y = ( x^2 + 10x ____ ) - 3 ____ ... take half of 10x and put a circle around him: 1/2 ( 10 ) = 5 ... 5 is circled guy

STEP 4: Square circled guy...

y = ( x^2 + 10x + 25 ) - 3 ____ ( 5 )^2 = 25 ... and put it here

STEP 5: THIS IS THE MOST FORGOTTEN STEP!

Remember that equations are like see-saws... We have to keep them balanced!

We just plopped 25 pounds onto the right side of the equation:

y = ( x^2 + 10x + 25 ) - 3 ____ ... the right side is heavier

So... we'll just take it back off!

*That's why I had you put a blank at the end...
So you wouldn't forget this!

Continued on the next page

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