The linear mapping A:R^2[x] -> R^2x2 is defined by the rule Ap= [p(0);p(1);p(-1);p(0)]. Then the rank of the mapping A is equal to 3. Why?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.3: Lines
Problem 41E
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The linear mapping A:R^2[x] -> R^2x2 is defined by the rule Ap= [p(0);p(1);p(-1);p(0)]. Then the rank of the mapping A is equal to 3. Why?

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