Let T:P_2→P_1T:P2→P1 be defined by T(a+bx+cx^2)=b+2c+(a-b)xT(a+bx+cx2)=b+2c+(a−b)x. Check that TT is a linear transformation. Find the matrix of the transformation with respect to the ordered bases B_1={x^2,x^2+x,x^2+x+1}B1={x2,x2+x,x2+x+1} and B_2={1,x}B2={1,x}. Find the kernel of TT.?
1 Answer
See below.
Explanation:
A linear transformation from a vector space V to a vector space W is a function
1." "T(u+v)=T(u)+T(v)1. T(u+v)=T(u)+T(v)
2." "T(cu)=cT(u)2. T(cu)=cT(u)
That is to say that T preserves addition (1) and T preserves scalar multiplication (2).
If
First let
- Show that T preserves addition:
T(u+v)=T((dx^2+ex+f)+(gx^2+hx+k))T(u+v)=T((dx2+ex+f)+(gx2+hx+k))
=>=T((d+g)x^2+(e+h)x+(f+k))⇒=T((d+g)x2+(e+h)x+(f+k))
=>=(e+h)+2(d+g)+((f+k)-(e+h))x⇒=(e+h)+2(d+g)+((f+k)−(e+h))x
and
T(u)+T(v)=T(dx^2+ex+f)+T(gx^2+hx+k)T(u)+T(v)=T(dx2+ex+f)+T(gx2+hx+k)
=>=(e+2d+(f-e)x)+(h+2g+(k-h)x)⇒=(e+2d+(f−e)x)+(h+2g+(k−h)x)
=>e+h+2d+2g+fx-ex+kx-hx⇒e+h+2d+2g+fx−ex+kx−hx
=>(e+h)+2(d+g)+((f+k)-(e+h))x⇒(e+h)+2(d+g)+((f+k)−(e+h))x
as found above. Therefore, we conclude that
2
T(cu)=T(c(dx^2+ex+f))T(cu)=T(c(dx2+ex+f))
=>=T(cdx^2+cex+cf)⇒=T(cdx2+cex+cf)
=>=ce+2cd+(cf-ce)x⇒=ce+2cd+(cf−ce)x
and
cT(u)=cT(dx^2+ex+f)cT(u)=cT(dx2+ex+f)
=>=c(e+2d+(f-e)x)⇒=c(e+2d+(f−e)x)
=>=ce+2cd+(cf-ce)x⇒=ce+2cd+(cf−ce)x
as found above. Therefore, we conclude that
Find the matrix representation of the transformation with respect to the ordered bases:
B_1={x^2,x^2+x,x^2+x+1}B1={x2,x2+x,x2+x+1} andB_2={1,x}B2={1,x}
I am not terribly familiar with this concept, but here is my attempt:
We will find a
T([(a), (b), (c)])=A[(a), (b), (c)]
Since we know that
T(x^2)=T(0+0x+1x^2)=2(1)=2
T(x^2+x)=T(0+1x+1x^2)=1+2(1)+(0-1)x=3-x
T(x^2+x+1)=T(1+1x+1x^2)=1+2(1)+(1-1)x=3
We will use the coefficients of the vector space polynomials to obtain our
The coefficients of
The coefficients of
The coefficients of
These four vectors give the
[(2,3,3),(0,-1,0),(0,0,0)]
If this does not agree with your expectations for what the answer should be, this may be helpful:
Find the kernel of T.
The kernal of a linear transformation T is the set of all vectors v such that
To find the null space we must first reduce the
[(1,0,3/2),(0,1,0),(0,0,0)]
Which provides the equations:
x_1=3/2
x_2=0
0x_3=0
We see that
Then