The problem asks us to evaluate the function $F(x) = x^2 + 3x - 9$ at $x = -2$ and $x = -5$, and then determine which of the given statements are true.

AlgebraPolynomial EvaluationFunctions
2025/4/21

1. Problem Description

The problem asks us to evaluate the function F(x)=x2+3x9F(x) = x^2 + 3x - 9 at x=2x = -2 and x=5x = -5, and then determine which of the given statements are true.

2. Solution Steps

First, evaluate F(2)F(-2).
F(2)=(2)2+3(2)9=469=11F(-2) = (-2)^2 + 3(-2) - 9 = 4 - 6 - 9 = -11.
So, F(2)=11F(-2) = -11.
Statement a) F(2)=2FF(-2) = -2F means F(2)F(-2) is 2-2 times some value FF, which is not related to the function F(x)F(x) defined. Since we know F(2)=11F(-2) = -11, statement a) should be F(2)=11F(-2) = -11 which is not 2F-2F for any constant FF.
Next, evaluate F(5)F(-5).
F(5)=(5)2+3(5)9=25159=1F(-5) = (-5)^2 + 3(-5) - 9 = 25 - 15 - 9 = 1.
So, F(5)=1F(-5) = 1.
Let's examine the provided statements:
a) F(2)=2FF(-2) = -2F. As stated above, we cannot say if this statement is true or false, because the variable FF on the right side is not defined, but the expression is clearly wrong.
b) F(5)=11F(-5) = -11. Since F(5)=1F(-5) = 1, this statement is false.
c) F(5)=17F(-5) = -17. Since F(5)=1F(-5) = 1, this statement is false.
d) F(5)=1F(-5) = 1. Since F(5)=1F(-5) = 1, this statement is true.

3. Final Answer

The true statement is d) F(5)=1F(-5) = 1.

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