## Algebra and Trigonometry 10th Edition

Recall: Conjugate pairs can be formed by changing the sign between the two terms, such as x+y to x-y. The difference of two perfect squares can be factored as the product of conjugate pairs. The difference of two perfect squares can be written as $x^{2}-y^{2}$ $$x^{2}-y^{2}=(x+y)(x-y)$$ Therefore, it is true.