Factor:

40a^2 - 32a

For those who don't know ^2 means squared or to the power of two

8a (5a - 4)

Step-by-step explanation:

To factor this expression, see what numbers and variables these two terms have in common. I can see that they both have the variable a, so a can be factored out.

40 and - 32 also have 8 in common, because they are both cleanly divisible by 8.

Now we can factor 8a out of 40a^2 - 32a. Think of how many times 8a goes into 40a^2 and - 32a.

8a (5a - 4)