Question 919498
{{{30x^2 -30x-10=0}}} .....simplify,all terms divide by {{{10}}}


{{{30x^2/10 -30x/10-10/10=0/10}}} 


{{{3x^2 -3x-1=0}}} ...use quadratic formula


{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 


{{{x = (-(-3) +- sqrt( (-3)^2-4*3*(-1) ))/(2*3) }}} 


{{{x = (3 +- sqrt( 9+12 ))/6 }}}

{{{x = (3 +- sqrt( 21 ))/6 }}}

{{{x = (3 +- 4.58257569495584)/6 }}}

{{{x = (3 +- 4.58)/6 }}}

solutions:

{{{x = (3 + 4.58)/6 }}}

{{{x = 7.58/6 }}}

{{{x = 1.26}}}

or

{{{x = (3 - 4.58)/6 }}}

{{{x = -1.58/6 }}}

{{{x =-0.26}}}


{{{drawing( 600, 600, -5, 5, -20, 20,circle(-0.26,0,.12),locate(-1.3,1.3,p(-0.26,0)),locate(1.3,1.3,p(1.26,0)),circle(1.26,0,.12), graph( 600, 600, -5, 5, -20, 20, 30x^2 -30x-10)) }}}