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Hi I need help with these questions and answers can you show me how you did them I want to make sure,

Thanks!

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( x(2 + 2x1 + 3 ) - - 10 ( 212 + 2 21 + 3 ) -11
Led ,
212 + 20+3 = t
then ,
above expression becomes ,
t2 - lot - 11
= t2 - lit +t-11
+ ( + - 11 ) +1 (t - 11 )
( t -11 ) ( t + 1 )
How , but t = 212...

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