This blog is the disorganized ramblings of College-Prep Tutor Phillip McCaffrey, who loves to help high school students beat the SAT, ACT and any other test for that matter [because tests don't REALLY matter in the long run]. philmccaffrey@gmail.com

## Thursday, November 15, 2007

### Another Parabola

Here is another parabola problem that has a square labeled PQRS with an area of 64. The top corners intersect a parabola that sits on the bottom side.

The function of the parabola is y=ax^2

The key to solving this problelm is remember that parabolas are symmetrical. Since the square root of 64 = 8, then all sides have a length of 8. QR = 8, and so the point R is (4,8)

Substitute these two points into the equation and solve

8 = a*(4)^2

8 = a* 16

8/16 = a * 16/16 a = 1/2

## Thursday, November 08, 2007

### Fun with Parabolas

**Fun with Parabolas**

### Email me any question

If you can think of the problem, email it to me.

If you can sketch it & scan it all the better

My email address is phil@mccaffreytutoring.com

I'd love to hear from you

## Wednesday, November 07, 2007

### Symmetrical Parabola's: opposit "a"

**REALLY BIG**clue. Looking something like:

*f(x)*= x^2

*f(x)*= -x^2 + k (where ^ is the symbol for exponent & k is a constant)

*f(x)*= -x^2 + k