1.

How to solve it

Answer»
{( {x}^{2} )}^{2}  +  {( {2}^{2}) }^{2} \\    { ({x}^{2} +2)  }^{2}  =  {x}^{4}  + 4 + 2{x}^{2} .2 \:  \\ so \\  {x}^{4}  + 4 =  { ({x}^{2} + 2) }^{2}  - 4{x}^{2}
HOPE this will HELP you.


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