QF - Solve Quadratics using the Quadratic Formula (Lesson)

Solve Quadratics Using the Quadratic Formula

x equals negative b plus or minus square root b squared minus four a c all over 2a So we have learned two methods of solving quadratics: Factor to Solve and Solve by Taking Square Roots. Next, we are going to look at the quadratic formula.

Sometimes, quadratic functions written in standard form ax2 + bx + c = 0 are prime, so the next option is to use the quadratic formula.

 

 

Watch this video to try a few problems.

 

 

Solve Quadratics using the Quadratic Formula Practice

Try these problems to see if you've got it. Give answers for #1-2 in exact form and #3 in approximate form:

  1. 2x2 = 7 - x
  2. x2 = 20 - 4x
  3. x2 - 6x + 4 = 0

TO VIEW THE SOLUTIONS ONCE YOU HAVE PRACTICED, CLICK HERE. Links to an external site.

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