By using identity

plzzz plzz tell me .....
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By using the identity
=> (a+b)²
=> (4x²+5)²
=> (4x²)²+(5)²+2(4x²+5)
=> 16x⁴+25+8x²+10
=> 16x⁴+8x²+35
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Apka kya haal h....
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