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Factorisation by Regrouping Terms

4 x x+8 x y+4...

Question

4xx+8xy+4yy

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Solution

4x² + 8xy + 4y²

Taking 4 as common,

= 4(x² + 2xy +y²) {(a+b)² = a² + b² + 2ab}

= 4(x + y)²

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