Question 50816
4x^2-x-5=0

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

{{{x = (1 +- sqrt( (-1)^2-4*4*-5 ))/(2*4) }}} 

{{{x = (1 +- sqrt( 1+80 ))/(8) }}}

{{{x = (1 +- (9))/(8) }}}

two solutions are available

first:


{{{x = (1 + (9))/(8) }}}

{{{x = 5/4 }}}

second: 

{{{x = (1 - (9))/(8) }}}

{{{x = -1 }}}