if a²+a+a=0 then proof that a⁴=a
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Step-by-step explanation:
a^2 + a + a = 0
a^2 + 2a = 0
a(a + 2) = 0
a + 2 = 0 or a = 0
a = -2 or 0
a^4 = 0^4 = 0 = a
Hence, proved.
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