Answer
See below.
Work Step by Step
$T(c(x_1,x_2))=T(cx_1,cx_2)=(cx_1+cx_2,2)\ne(cx_1+cx_2,2c)=cT(x_1,x_2)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.