Bonjour,
[tex]B=6t(t+7)-3t(-t-5)\\B=-6t^2+42t+3t^2+15t\\B=-3t^2+57t[/tex]
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Bonjour,
[tex]B=6t(t+7)-3t(-t-5)\\B=-6t^2+42t+3t^2+15t\\B=-3t^2+57t[/tex]