## anonymous one year ago What is the line of symmetry for the parabola whose equation is y = -x2 + x + 3?

1. anonymous

x=-1 x=-1/2 x=1/2

2. anonymous

complete the square on R.H.S

3. anonymous

$y=-\left( x^2-x+\frac{ 1 }{ 4}-\frac{ 1 }{ 4 } \right)+3$

4. anonymous

$y=-\left( x-\frac{ 1 }{ 2 } \right)^2+\frac{ 1 }{ 4 }+3$ $\left( x-\frac{ 1 }{ 2 } \right)^2=-\left( y+\frac{ 13 }{ 4 } \right)$ can you find your solution.

5. anonymous

yes thanks