3. Which of the following mappings are linear transformations? Give a proof (directly using the definition of a linear transformation) or a counterexample in each case. [Recall that Pn(F) is the vector space of all real polynomials p(x) of degree at most n with values in F.] ·(2) = (3n+2) =) · (i) 0 : R³ → R² given by 0 y 3y z ax4 + bx² + c). (ii) : P2(F) → P₁(F) given by (p(x)) = p(x²) (so (ax² + bx + c) = ax4 þ

A translation in R2 is a function of the form T(x,y)=(xh,yk), where at least one of the constants h and k is nonzero. (a) Show that a translation in R2 is not a linear transformation. (b) For the translation T(x,y)=(x2,y+1), determine the images of (0,0,),(2,1), and (5,4). (c) Show that a translation in R2 has no fixed points.

Let T be a linear transformation from R2 into R2 such that T(1,0)=(1,1) and T(0,1)=(1,1). Find T(1,4) and T(2,1).

Let T:RnRm be the linear transformation defined by T(v)=Av, where A=[30100302]. Find the dimensions of Rn and Rm.