Monday, December 11

# Formula Help. How to Make a Letter The Subject of a Formula

Remember, to make a letter the subject of a formula, first swap the two sides of the formula around and then apply the correct inverse operation to both sides of your formula. The examples here only require 1 inverse operation but are a little bit trickier, so if you need to look at some easier ones first then click here.

Example 1 on making subjects.

Make d the subject of this formula:

e = 8f + d

First change the two sides of the formula around. This will make applying the inverse operations easier.

8f + d = e

Now you need to get rid of the +8f on the left hand side of the formula which can be done by taking off 8f from both sides of the formula. This will give you:

d = e – 8f.

Therefore, you have now made d the subject of your formula as required.

Example 2 on making subjects.

Make m the subject of this formula:

p = 2πm

First change the two sides of the formula around. This will make applying the inverse operations easier.

2πm = p

Now you need to get rid of the ×2π on the left hand side of the formula which can be done by ÷2π. This will give you:

m = p/2π

Therefore, you have now made m the subject of your formula as required.

Example 3 on making subjects.

Make t the subject of this formula:

r = t²

First change the two sides of the formula around. This will make applying the inverse operations much easier.

t² = r

Now you need to get rid of the square on the left hand side of the formula which can be done by taking the square root. This will give you:

t = √r

Therefore, you have now made t the subject of your formula as required.