Which expressions are differences of squares?

select each correct answer.

k2+81

p2−40

n2−225

t2−1

The correct options are 3 and 4.

Step-by-step explanation:

The difference of squares is defined as

In option 1,

It can be written as

It is the sum of squares, therefore the option 1 is incorrect.

In option 2,

The number 40 is not a complete square of any number, therefore option 2 is incorrect.

In option 3,

It can be rewritten as

It is the difference of squares, therefore option 3 is correct.

In option 4,

It can be rewritten as

It is the difference of squares, therefore option 4 is correct.

sorry not sure

step-by-step explanation:

you can't solve x because it is 2 linear equation and you only have one equation