Question 220887
The equation is called quadratic, or 2nd degree.
When you plot it on a graph, it's called a parabola.
It's in the form {{{ax^2 + bx + c = 0}}}, but first
subtract {{{180}}} from both sides, and it will be in
that form
{{{x^2 + 7x - 180 = 0}}}
Matching it up with the general equation,
{{{a = 1}}}
{{{b = 7}}}
{{{c = -180}}}
Now use the quadratic formula to solve
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{x = (-7 +- sqrt( 7^2-4*1*(-180) ))/(2*1) }}}
{{{x = (-7 +- sqrt( 49 + 720 ))/(2*1) }}}
{{{x = (-7 +- sqrt( 769 ))/2 }}}
769 isn't a perfect square- are you sure you
copied this right?