Question

Which expressions are differences of squares?

Choose all answers that are correct.

Question 1 options:

a^2 + 1


h^2 – 20


t^2 – 4


x^2 – 169

Answer 1

Because it asks for DIFFERENCES, we can automatically get rid of one answer choice

Answer 2

MtH: How would you recognize a perfect square?
1) What does a perfect square look like if only a letter (not a number) is involved/
2) What are examples of perfect squares of integers (numerals)?