Question 456252


 {{{x^2 + 7x + 8 = 0}}}

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


{{{x = (-7 +- sqrt( 7^2-4*1*8 ))/(2*1) }}}


{{{x = (-7 +- sqrt( 49-32 ))/2 }}}


{{{x = (-7 +- sqrt( 17))/2 }}}


{{{x = (-7 +- 4.12)/2 }}}

solutions:

{{{x = (-7 + 4.12)/2 }}}

{{{x = -2.88/2 }}}

{{{x = -1.44 }}}

or

{{{x = (-7 - 4.12)/2 }}}

{{{x = -11.12/2 }}}

{{{x = -5.56 }}}


graph:


{{{ graph( 500, 500, -10, 10, -10, 10, x^2 + 7x + 8) }}}