Math Question pg 361 #9

Test Preparation SAT Preparation
1

<p>Not in the list</p>

<p>help please</p>

2

<p>which book? ..there's no #9 on page 361 in teh blue book.</p>

3

<p>sorry i meant #8</p>

<p>(blue book)</p>

<p>here's the question</p>

<p>sqrt(x^2-t^2)=2t-x</p>

<p>If x and t are positive number that satisfy the equation above, what is the value of (x/t) ?</p>

4

<p>what are the answer choices? (don't have book, srry).</p>

5

<p>grid in</p>

<p>the answer is 5/4</p>

6

<p>Square both sides of the equation; you get</p>

<p>x^2 - t^2 = x^2 - 4tx + 4t^2
5t^2 - 4tx = 0
t( 5t - 4x) = 0
t > 0 , so 5t - 4x = 0
5t = 4x
x/t = 5/4</p>

7

<p>i see, thanks</p>

8

<p>thanks that was buggin me.</p>