Question

(a^2 + b^2 ) (-a^2+b^2)

Plz plz do it fast for me!!

Answer 1

Formula to be used
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$= > \bf \: (x+ y)(x - y) = {x}^{2} - {y}^{2}$
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$= > \bf \: ({a}^{2} + {b}^{2} )( {b}^{2} - {a}^{2} ) \\ \\ = > {( {b}^{2}) }^{2} - {( {a}^{2}) }^{2} \\ \\ = > \bf \underline{ {b}^{4} - {a}^{4} }$
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