# make s subject

• November 17th 2009, 03:41 PM
decoy808
make s subject
make s subject

t = v√ $s^2$+9

this is what im at help me if you can. many thanks

$t^2$/v-9 = s
• November 17th 2009, 04:02 PM
pickslides

$t = v\sqrt{s}^2+9$

then it can be re-written as

$t = vs+9$

as the square ad square root are opposites.

Now taking 9 from both sides

$t-9 = vs$

$vs= t-9$

and dividing v

$s= \frac{t-9}{v}$

now s is the subject.
• November 18th 2009, 01:40 AM
decoy808
im having problems geting the correct value.

the first part of the question was to find V? which i found to be 2

V= 2
T=10
S= 4

so making s the subject i should get answer 4?
s= t-9/v
4 = 10-9/2
• November 18th 2009, 02:07 AM
aidan
Quote:

Originally Posted by decoy808
make s subject
t = v√ $s^2$+9
this is what im at help me if you can. many thanks
$t^2$/v-9 = s

It looks as if you meant this:

$t = v \sqrt{s^2 + 9 }$

then to make s the subject:

$s = \sqrt{ \left( \dfrac{t}{v} \right)^2 - 9}$

$s = \sqrt{ \left( \dfrac{10}{2} \right)^2 - 9}\,\, = 4$