Question

please someone tell please send explain both questions please I will mark you as a brainlist promise please help me ​

Answer 1

Answer:

2.    x4−(x−z)4

=(x2)2−{(x−z)2}2

=(x2+(x−z)2)(x2−(x−z)2)2

=(x2+x2−2xz+z2)(x+x−z)(x−x+z)

=(2x2−2xz+z2)(2x−z)(z)

Sorry friend i don't know of number 1.