Question 348165
*Note: Begin by muultiplying by 10.    (4.9 = 49/10)

{{{60=16x+4.9x^2}}}
{{{60=16x+(49/10)x^2}}}
{{{600=160x+49x^2}}}
.
Simplify
{{{0=49x^2 + 160x-600}}}
.
solve using the Quadratic Formula
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
.
*[invoke quadratic "x", 49, 160, -600]