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3t(t+2)-(3t^2+5t) when t=19
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3t(t+2)-(3t^2+5t) when t=19

User Lalit Fauzdar
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hello :
3t(t+2)-(3t^2+5t) when t=19
3(19)(19+2)-(3(19)²+5(19) =(57)(21)-(1083+95) =1197-1178 =19
User Gordon Bean
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