can someone check my work please.

Question

Can someone please let me know if i solved this equation correctly?

 

Find the exact solutions and simplify as much as possible: 10x²-1=8x

 

10x² -1-8x=8x-8x

10x² -8x -1 = 0

 

I then used quadratic formula with a = 10 b = -8 c =-1

 

x = -(-8)± √(-8)²-4(10)(-1)

                -------------------

                     2(10)

 

 

x = 8± √104

     -----------

          20

 

x = 2/5 + 1/10 √26 

 

or

 

x = 2/5 + -1/10 √26

Answer 1

You are right all's correct.

 

[you can check you answer at http://www.math.com/students/calculators/source/quadratic.htm ]