Cool math fractal

math image

math image

pre-algebra help lessonsalgebra help lessonsprecalculus / calculus help lessonsmath anxiety survival guidegeometry math artmath and jigsaw puzzlesCoolmath booksother math stuff
math help lessonsmath practice problemsmath gamesmath dictionarygeometry trigonometry reference area
teacher's areaparent's areaCoolmath 4 kidsSpike's Game ZoneFinance FREAKTotally Stressed OutScience Monster
Coolmath Algebra
Solving Quadratics Lesson 6 - Overview   (page 3 of 4)
---- This algebra lesson gives an overview and review of the techniques used to solve quadratic equation: factoring, taking the square root of both sides, the quadratic formula (quadranator).

math image
Now available: Coolmath Algebra books! Part 1, Part 2 and Part 3 covering the Algebra you need from Algebra 1 through Precalculus Algebra (Beginning Algebra through College Algebra)

other Coolmath Books: Coolmath Precalculus Review (the math you really need to survive Calculus 1) and Math Survival Guide (How to conquer math and deal with math anxiety)
line
Graphing Calculator Scientific Calculator << a new window will open for these
line

METHOD 3: The Quadranator

*After a failed 10 second factor attempt,
whack it with this and it will work every time. 
The problem is: If you forget the formula, you're dead meat.

ax^2 + bx + c = 0 ... x = -b +/- sqrt( b^2 - 4ac ) / 2a

Example:

Solve  3x^2 - 10x + 1 = 0

 

x = - ( -10 ) +/- sqrt( ( -10 )^2 - 4 ( 3 ) ( 1 ) ) / ( 2 (3 ) ) = 10 +/- sqrt( 100 - 12 ) / 6 = 10 +/- sqrt( 88 ) / 6

exact: { 10 - sqrt( 88 ) / 6 , 10 + sqrt( 88 ) / 6 }

decimal approximation: { .103 , 3.230 }

TRY IT:

Solve  2x^2 + 11x + 1 = 0

Continued on the next page

 The printing and distribution and/or downloading of these lessons is strictly prohibited.
line
Graphing Calculator Scientific Calculator << a new window will open for these
line

.....:::::::::::::::  HELP SUPPORT COOLMATH  :::::::::::::::.....
:::::::  link to us   :::::::   advertise with us  :::::::  why we have ads  :::::::

Thanks for visiting Coolmath.com
© 1997-2010 Coolmath.com, Inc.