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2 Answers

3x^2 +3x -27=0

(x-2.5413813)*(x+3.5413813)

(-b/2a)=-0.5

b^2 -4ac=333...sq root(333)=18.248287591
by

3x^2+3x-27  First take out the 3

3(x^2 + x - 9)  now factor I do not see a way other than the quadratic equation

a = 1, b = 1, c  = -9

               ________

x = -b ± √ b2 – 4ac

     -----------------------

               2a

               __________

x = -1 ± √ 12 – 4*1*-9

     -----------------------  

               2*1

               _______

x = -1 ± √ 1 + 36

      ---------------------

                  2

               ____

x = -1 ± √ 37

     -------------

            2

                  __

x = -1/2 ± √37/2

 

 

 

by Level 10 User (55.7k points)

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