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5x^2-8x-4=0 solve using quadratic formula

I know the answer is -2/5, 2 but I can not write it out with that number. can you help me see the steps. thank you

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Jim S. | Physics (and math) are fun, reallyPhysics (and math) are fun, really
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Roseland,
                Complete the square and the roots are (4/5) -(2/5)i and (4/5)+(2/5)i where i=√-1
 
Jim