Question

Calcule F(a+3) y F(-2a) para:


1. $x^{2}-4$


2. $\frac{1}{x}$


3. $\sqrt{x+1}$


Dato: a > 0

Answer 1

1. F(a+3)=x^2 - 4 = (a+3)^2 - 4
= a^2 + 6a + 9 - 4
= a^2 + 6a + 5

F(-2a) = (-2a)^2 - 4 = 4a^2 - 4 = 4(a^2 - 1)

2. F(a+3) = 1/x = 1/(a+3)

F(-2a) = 1/x = 1/-2a = - 1/2a

3. F(a+3) = Raíz [(a+3)+1)] = Raíz(a+3+1) =
Raíz(a + 4)

F(-2a) = Raíz(-2a + 1)