Question

(y+3)(y-3)(y+6)(y-6) = with steps

Answer 1

={(y+3)(y-3)}{(y+6)(y-6)}
={y^2+3y-3y-9}{y^2+6y-6y-36}
=(y^2-9)(y^2-36)
=y^4-36y^2-9y^2+324
=y^4-45y^2+324
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Answer 2

(y+3)(y-3)(y+6)(y-6)
=(y^2 - 3^2)(y^2 -6^2)
=(y^2 - 9)(y^2 - 36)
=y^4 - 36y^2 -9y^2 + 324
=y^4 -45y^2 + 324