a^4+ 4a^2 - 5 factorisation of middle terms
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Step-by-step explanation:
a⁴ + 4a² - 5
a⁴ + 5a² - a² - 5
a²(a² + 5) - (a² + 5)
(a² - 1)(a² + 5)
(a + 1)(a - 1)(a² + 5)
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