Question

Which of the following are in form of different squares. NEED HELP PLEASE HURRY!!

Answer 1

All but the fourth

Explanation:

The fourth is a sum (+) not difference (-).

All others are some form of difference of squares:

`169x^4-49 = \left(13x^2\right)^2-7^2`

difference of square of number 13x² and square of number 7

`36-25b^2=6^2-(5b)^2`

difference of square of number 6 and square of number 5b

`100-r^2=10^2-r^2`

difference of square of number 10 and square of number r

`64y^2-81=(8y)^2-9^2`

difference of square of number 8y and square of number 9

Answer 2

The first and last boxes are difference of squares, because both numbers are a perfect square and the variable has a exponent (2)