f(x) = 2x^2 -9

Question

Given f(x) = 2x^2 - 9, what is the value of f(5)?

x: 5
f(x):

Answer 1

To find the value of \( f(5) \) for the function \( f(x) = 2x^2 - 9 \), we can substitute \( x = 5 \) into the function.

\[ f(5) = 2(5)^2 - 9 \]

Calculating \( (5)^2 \):

\[ (5)^2 = 25 \]

Now substitute back into the equation:

\[ f(5) = 2(25) - 9 \]

Calculating \( 2(25) \):

\[ 2(25) = 50 \]

Now subtract \( 9 \):

\[ f(5) = 50 - 9 = 41 \]

Therefore, the value of \( f(5) \) is \( \boxed{41} \).