Friday

January 30, 2015

January 30, 2015

Posted by **ladybug** on Monday, November 12, 2012 at 10:19pm.

y= -x^2-6x

- college algebra--need help Please!!! -
**Reiny**, Monday, November 12, 2012 at 11:17pmYou can complete the square ....

y = -(x^2 + 6x**+9 - 9**

= -( (x+3)^2 - 9)

= -(x+3)^2 + 9

vertex is (-3, 9)

alternate method:

for y = ax^2 + bx + c

the x of the vertex is -b/2a

for for yours

the x of the vertex is -(-6)/-2 = -3

sub into the function ...

y = -9 + 18 = 9

so the vertex is (-3,9) as above

The simplest way is to use Calculus, but I am not sure if you are studying Calculus.

- college algebra--need help Please!!! -
**ladybug**, Tuesday, November 13, 2012 at 3:51amReiny,

It seems like Calculus, but it actually falls under college algebra. Because I can get some calculus tutoring and the answers fit. Thank you for the help, it is greatlt appreciated!!!

**Answer this Question**

**Related Questions**

college algebra - given the folowing quadratic equations find the vertex the ...

maths - how do i find out the the equation of the line of symmetry for f(x)=ax^2...

algebra - 1)Find the exact solutions to 3x^2=5x-1 using the quadratic formula. ...

Algebra - Can you please help me with the following problems? Find the ...

College algebra - Given the following quadratic equation find. a) the vertex b) ...

college algebra - Given the following quadratic equation, find;? a. the vertex ...

college algebra - Given the following quadratic equation, find a. the vertex b. ...

Algebra Problems - Please check my answers. Find the coordinates of the vertex ...

college algebra - for the given function f&g, find the following and state the ...

Algebra - Please check my answers. Find the coordinates of the vertex for the ...