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Factorise : x^4+3x^2-28...

Factorise : `x^4+3x^2-28`

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To factorize the polynomial \( x^4 + 3x^2 - 28 \), we can follow these steps: ### Step 1: Substitute Let \( y = x^2 \). Then, the expression becomes: \[ y^2 + 3y - 28 \] ...
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