Which shows a difference of squares?

10y^2−4x^2

16y^4−x^2

8x^2−40x+25

64x^2−48x+9

A difference of squares must be a binomial, so we want two terms. This rules out the third and fourth options.

If we look at the first two, we must check that both terms are perfect squares.

Look at the first one: is a perfect square (it's ), but is not a perfect square, because 10 is not a perfect square.

On the other hand, if we look at the second option, is the square of , and is clearly the square of . So, this is the difference of two squares.

20

step-by-step explanation:

sum= when you add is how much the whole amount is

distance= when you use angles and it means how far it goes

step-by-step explanation: