Friday

March 27, 2015

March 27, 2015

Posted by **Mackenzie** on Thursday, June 7, 2012 at 8:40am.

y = -5x2 - x + 9

Answer 1.) x=3/2

2.) Determine the equation of the axis of symmetry.

y = -6x2 + 3x - 4

Answer 2.) x=-2/10

- Algebra 1B--Check Please! -
**MathMate**, Thursday, June 7, 2012 at 10:08amI assume you have not done calculus before.

To find the axis of symmetry of a polynomial of second degree (quadratic), we only have to complete the squares, which will then give the coordinates of the vertex in the form V(h,k) where

y=a(x-h)²+k

and a is another constant.

Starting with

y = -5x2 - x + 9

we write

y=-5(x²+2(x/10))+9

=-5(x+1/10)²+5/100 +9

=-5(x+1/10)² +9.05

Therefore h=-1/10, k=9.05, and

V(-1/10,9.05)

or the axis of symmetry is x=-1/10

I will leave #2 for you as practice.

- Algebra 1B--Check Please! -
**Mackenzie**, Thursday, June 7, 2012 at 10:17amThanks! so number two is wrong?

- Algebra 1B--Check Please! -
**MathMate**, Thursday, June 7, 2012 at 10:33am#2 is not correct.

You can follow the steps above and try again.

**Answer this Question**

**Related Questions**

Alegrba - Please check my answers. Also, can I see some graphs of y-axis ...

Algebra-Polynomails - Please explain to me orgin of symmetry, y-axis semmetry, ...

Algebra - Find the axis of symmetry for y=x^2+4x-7 Find the axis of symmetry for...

symmetry help - find any intercepts of the graph of the given equation. ...

Algebra - Find the vertex and the axis of symmetry for the parabola with the ...

math-please help,need quickly - find the slant asymptote of the graphof the ...

calculus - A parabola ,f, intersect the x axis at A and B and the y axis at C. ...

ALG. REPOST TYPO - Find the coordinates of the vertex and the equation of the ...

ALG. - Find the coordinates of the vertex and the equation of the axis of ...

math - 1 identify the coordinates of the vertex and the equation of the axis of ...