Is it a prime?
No, you use the difference of 2 squares pattern.
(7x^2 + 9y) (7x^2 - 9y)
49x^(4)-81y^(2)
The binomial can be factored using the difference of squares formula, because both terms are perfect squares. The difference of squares formula is a^(2)-b^(2)=(a-b)(a+b).
(7x^(2)-9y)(7x^(2)+9y)
difference of two squares
=(7x^2+9y)(7x^2-9y)
Comments
No, you use the difference of 2 squares pattern.
(7x^2 + 9y) (7x^2 - 9y)
49x^(4)-81y^(2)
The binomial can be factored using the difference of squares formula, because both terms are perfect squares. The difference of squares formula is a^(2)-b^(2)=(a-b)(a+b).
(7x^(2)-9y)(7x^(2)+9y)
No, you use the difference of 2 squares pattern.
(7x^2 + 9y) (7x^2 - 9y)
difference of two squares
=(7x^2+9y)(7x^2-9y)