Question 930730

{{{5x^4-7x^3 -2x^2 = 0}}}

{{{x^2(5x^2-7x -2) = 0}}}

{{{x^2(5x^2-7x -2) = 0}}}

solutions:

if {{{x^2 = 0}}}=> {{{x=0}}}-double solution

{{{(5x^2-7x -2) = 0}}} use quadratic formula

{{{x = (-(-7) +- sqrt( (-7)^2-4*5*(-2) ))/(2*5) }}}

{{{x = (7 +- sqrt( 49+40 ))/10 }}}

{{{x = (7 +- sqrt( 89 ))/10 }}}

exact solutions:

{{{x = (7 + sqrt( 89 ))/10 }}}

{{{x = (7 - sqrt( 89 ))/10 }}}


A=__{{{0}}}___
B=___{{{(7 + sqrt( 89 ))/10 }}}___
C=___{{{ (7 - sqrt( 89 ))/10 }}}___