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Lisa solved  3x2 + 1 = 28  as shown.

3x2 + 1 = 28 

3x2  = 27

 x2  = 9

She concluded that the solutions to this quadratic equation are x = -9   or   x = 9.  Using a complete sentence, explain what mistake she made.  

 

also 

 

 

Lisa solved  3x2 + 1 = 28  as shown.

3x2 + 1 = 28 

3x2  = 27

 x2  = 9

She concluded that the solutions to this quadratic equation are x = -9   or   x = 9.     What are the correct solutions to this quadratic and how did you arrive at your answer?

Guest Sep 25, 2018
 #1
avatar+90053 
+1

Answered here  :   https://web2.0calc.com/questions/math-help_148

 

 

 

cool cool cool

CPhill  Sep 25, 2018

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