factorise the following
a⁴ - 7a² + 1
ans: (a²+ 3a+ 1) ( a² - 3a +1)
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a^4-7a^2+1
=a^4+2a^2+1-9a^2
=(a^2+1)^2-(3a)^2
=(a^2+1+3a)(a^2+1-3a)
Proved.
Hope it helps.
jothipalanisampde3wo:
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answer is given above
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