Posted by **priya ** on Friday, October 22, 2010 at 3:40pm.

i need help doing this question...

a quadratic funtion has these characteristics

axis of symmetry: -1

x=3 is the x- int

y= 32 is the maximum value

determine the y int of this parabola.

- Grade 11 Math -
**Reiny**, Friday, October 22, 2010 at 4:46pm
your information of "axis of symmetry : -1 " is ambiguous.

the axis of symmetry is a line, so it should be stated as an equation x = -1

I will assume that is what you meant.

vertex is (-1,32)

so the equation is

y = a(x+1)^2 + 32

but the x-intercept is 3, meaning the point (3,0) lies on it

0 = a(3+1)^2 + 32

a = -32/16 = -1/2

y = (-1/2)(x+1)^2 + 32

## Answer This Question

## Related Questions

- calculus - use symmetry to evaluate the double integral (1+x^2siny+y^2sinx)dA, R...
- math quadratic equations - a) expand and simplify: (4x-3)(x+1) i get 4x^2+x-3 ? ...
- Precalc - #1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if any, domain...
- Check my precalc? - #1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if ...
- computer science - int *reverse(const int *, int); int *temp; temp = reverse(...
- check my precalc - #1. (3x^3-4x^2-3x+4)/(x^3-5x) my answers: y-int: NONE x-int: ...
- Precalc - #1. (3x^3-4x^2-3x+4)/(x^3-5x) my answers: y-int: NONE x-int: 1, -1, ...
- Computers - //program that puts two lists in order in one single list with all ...
- Computer (C) - I need help with c programming, i need to fill in the code and I ...
- Computer Science - //program that puts two lists in order in one single list ...

More Related Questions