Question

a^4-b^4=what is the expansion

Answer 1

$a {}^{4} - {b}^{4} \\ = ({a}^{2}) {}^{2} - ({b}^{2} ) {}^{2} \\ = ( {a}^{2} + {b}^{2} )( {a}^{2} - {b}^{2} )$

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Answer 2

$HEYA \: \\ \\ a {}^{4} - b {}^{4} = \\ (a {}^{2} + b {}^{2} ) {}^{2} - 2a {}^{2} \times b {}^{2} \\ \\ or \: \\ \\ a {}^{4} - b {}^{4} = \\ (a {}^{2} - b {}^{2} ) \times (a {}^{2} + b {}^{2} )$