There is a linear transformation from P1 to P1

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SUMMARY

The discussion centers on a linear transformation T from the set of polynomials P1 of degree at least 1. Given the transformations T(1 + 2x) = 2 + 4x and T(4 + 7x) = -2 + 2x, participants analyze how to find T(-3 - 5x). The correct answer is determined to be 4 + 2x, contradicting an earlier miscalculation of 6x. The conversation highlights the importance of correctly applying linear transformations and understanding polynomial bases.

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Axoren
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Homework Statement


There is a linear transformation T from P1 to P1 where P1 is the set of all polynomials of degree at least 1.
T(1 + 2x) = 2 + 4x and T(4 + 7x) = -2 + 2x

Find T(-3 - 5x).

Homework Equations


T(1 + 2x) = 2 + 4x
T(4 + 7x) = -2 + 2x

The Attempt at a Solution


Basis B1 = [1, 2] [4, 7]
Basis B2 = [2, 4] [-2, 2]

[-3, -5] in terms of Basis 1 = [1, -1], bring that into Basis 1 gives you 1*[2, 4x] + -1*[-2, 2x] = [0, 6x]

The answer is not 6x.
 
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Why do you think 1*[2, 4x] + -1*[-2, 2x] = [0, 6x]? That doesn't look at all right.
 
Dick said:
Why do you think 1*[2, 4x] + -1*[-2, 2x] = [0, 6x]? That doesn't look at all right.

Haven't slept in 3 days, the other day, I was trying to calculate the cross product of two vectors in R5. What's worse, is I ended up with an answer.


Close this, the answer's 4 + 2x.
 

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