Question

solve
$(y^{2} - 5)( - y^{2} + 5)$
answer fast please
full method​

Answer 1

$\huge\star\pink{answer}$

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$(y^{2} - 5)( - y^{2} + 5)$

$= - y {}^{4} + 5y {}^{2} + 5y {}^{2} - 25 \\ \\ = - y {}^{4} + 10y {}^{2} - 25 \\ \\ = - y {}^{2} (y {}^{2} - 10) - 25$

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I hope it helps you