Multiply (x^2 − y^2)(x^2 +y^2) using the distributive property and combine like terms. generalize the pattern that emerges to write down an identity for (x^n-y^n)(x^n+y^n) for positive integers n.

Tamar is measuring the sides and angles of tuv to determine whether it is congruent to the triangle below. which pair of measurements would eliminate the possibility that the triangles are congruent