Solving Quadratic Equations - Cool math Algebra Help Lessons

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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).

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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

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 }

TRY IT:

Solve

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