Which page is this in the book
The value of m2 is 1/7(m1 + 54)
The given expression is :
2xx+3-5(x-2)
We know that, 

Aleena expands 2xx+3-5(x-2) as 2x²+3-5x-10. She is mistaken because the sign before 10 should be +10 instead of -10. Hence, the correct expanded form is 2x²+3-5x+10. Hence, this is the required solution.
Tn=3n-5
therefore: T(3)=3(3)-5
T(3) =4