Question

Find the axis of symmetry for this parabola:

y = -x2 − 2x − 5

is -3 the axis of symmetry

Answer 1

Hold on I'll help. Just need a second

Answer 2

x^2 + 2x - 5 = y

Now we need to rearrange
x^2 + 2x + ? = y-5

Answer 3

the axis of a parabola
y = ax^2+bx+c, is given by the subsequent equation::
\[\Large x = - \frac{b}{{2a}}\]

Answer 4

in this case a = 1, and b = 2 right? @Michele_Laino

Answer 5

I think
a=-1
and b=-2
since we have to look at the original equation

Answer 6

oh yes I forgot that there are negative values

Answer 7

So that means the equation would be\[x= -\frac{ -2 }{ 2(-1)}\]

Answer 8

Or
\[x = -\frac{ -2 }{ -2 }\]

Answer 9

Or
\[x = - \frac{ 1 }{ 1 }\]

Answer 10

Or

x = 1

Answer 11

@Michele_Laino

Answer 12

I thin, it is x=-1

Answer 13

think*