Answer:
the seven question is not clear
Step-by-step explanation:
22 + 1 = -x + 4
23 = -x + 4
- 4 - 4
________
19 = −x
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x⁴-y⁴
=(x+y)(x-y)(x²+y²)
=(x²-y²)(x²+y²)
=x⁴-y⁴