Factorise it : x4 + 5x2 + 9
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Step-by-step explanation:
Factorise x 4 5x 2 9
The expression is x4 + 5x2 + 9. Add and subtract x2. This is in the form of a2 - b2 which is equal to (a + b) (a - b) where a = x2 + 3 and b = x.
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