1.

Factorise (y^4 - 8y^2 + 16)Please solve. ​

Answer»

Step-by-step EXPLANATION:

{y}^{4} - 8 {y}^{2} + 16

= {y}^{4} - 4 {y}^{2} - 4 {y}^{2} + 16

= {y}^{2} ( {y}^{2} - 4) - 4( {y}^{2} - 4)

= {( {y}^{2} - 4)}^{2}

= { {(y}^{2} - {2}^{2}) }^{2}

= {(y + 2)}^{2} {(y - 2)}^{2}


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