Simplify [itex]-d^2+[9d+(2-4d^2)][/itex](adsbygoogle = window.adsbygoogle || []).push({});

[itex]-d^2+[9d+(2-4d^2)][/itex]

[itex]d^2[-9d-2+4d^2][/itex]

[itex]d^2+4d^2-9d-2[/itex]

[itex]5d^2-9d-2[/itex]

but wolfram says the answer is

[itex]-5d^2-9d+2[/itex]

What did I do wrong?

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# Basic algebra question

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