Question 295637
It's already in vertex form.
Vertex: {{{x=-2}}}, {{{y=5}}}
To find the y-intercept, set x=0 and solve for y.
{{{y=-3(x+2)^2+5}}}
{{{y=-3(2)^2+5}}}
{{{y=-3(4)+5}}}
{{{y=-12+5=7}}}
(0,-7)
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{{{ graph( 300, 300, -6, 2, -8, 6, -3(x+2)^2+5) }}}