Question 980958

{{{x^2+7x=4}}}


{{{x^2+7x-4=0}}}


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


{{{x = (-7 +- sqrt( 7^2-4*1*(-4) ))/(2*1) }}}


{{{x = (-7 +- sqrt( 49+16 ))/2 }}}


{{{x = (-7 +- sqrt( 64 ))/2 }}}


{{{x = (-7 +- 8)/2 }}}


solutions:

{{{x = (-7 + 8)/2 }}}

{{{x = 1/2 }}}

or

{{{x = (-7 - 8)/2 }}}

{{{x = -15/2 }}}

{{{x = -7.5 }}}