- #1
Susanne217
- 317
- 0
Hi
I am presented with the following problem
Let [tex]P_{4}(\mathbb{R}) = \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3|a_0,a_1,a_2,a_3 \in \mathbb{R} \} [/tex]
Then let S be a subset of [tex]P_4(\mathbb{R})[/tex] where
[tex]S = \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3|a_0+a_1+a_2+a_3 = 0 \}[/tex]
Show that S is a subspace of [tex]P_4(\mathbb{R})[/tex]
I that according to theory that for a space to be a subspace of a vector space then it has to comply with two axioms
1) closed under addition
2) closed under scalar multiplications
Since [tex]since (x,x^2,x^3)[/tex] belongs to S then [tex] \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3 \}[/tex] also belongs to S and thusly condition 1) holds?
Since (x,x^2,x^3) belongs to S then as since [tex]a_0,a_1,a_2,a_3[/tex] belongs to [tex]\mathbb{R}[/tex] then [tex] \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3 \}[/tex] also belongs to S. Thus condition 2) Holds and hence is a subspace of the original space.
I am presented with the following problem
Homework Statement
Let [tex]P_{4}(\mathbb{R}) = \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3|a_0,a_1,a_2,a_3 \in \mathbb{R} \} [/tex]
Then let S be a subset of [tex]P_4(\mathbb{R})[/tex] where
[tex]S = \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3|a_0+a_1+a_2+a_3 = 0 \}[/tex]
Show that S is a subspace of [tex]P_4(\mathbb{R})[/tex]
Homework Equations
I that according to theory that for a space to be a subspace of a vector space then it has to comply with two axioms
1) closed under addition
2) closed under scalar multiplications
The Attempt at a Solution
Since [tex]since (x,x^2,x^3)[/tex] belongs to S then [tex] \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3 \}[/tex] also belongs to S and thusly condition 1) holds?
Since (x,x^2,x^3) belongs to S then as since [tex]a_0,a_1,a_2,a_3[/tex] belongs to [tex]\mathbb{R}[/tex] then [tex] \{a_0 + a_1 \cdot x + a_2 \cdot x^2 + a_3 \cdot x^3 \}[/tex] also belongs to S. Thus condition 2) Holds and hence is a subspace of the original space.
Last edited: