Answer:
The correct options are 3 and 4.
Step-by-step explanation:
The difference of squares is defined as
[tex]a^2-b^2[/tex]
In option 1,
[tex]k^2+81[/tex]
It can be written as
[tex]k^2+9^2[/tex]
It is the sum of squares, therefore the option 1 is incorrect.
In option 2,
[tex]P^2-40[/tex]
The number 40 is not a complete square of any number, therefore option 2 is incorrect.
In option 3,
[tex]n^2-225[/tex]
It can be rewritten as
[tex]n^2-(15)^2[/tex]
It is the difference of squares, therefore option 3 is correct.
In option 4,
[tex]t^2-1[/tex]
It can be rewritten as
[tex]t^2-1^2[/tex]
It is the difference of squares, therefore option 4 is correct.
Answer: I took the test and here are the correct answers.
Step-by-step explanation:
