Question

If f(x)= 2x^2 - 5 what is f(-5)

Answer 1

To evaluate this function, substitute -5 for x into the function and simplify :

⇒
`\sf{f(x)=2x^2-5}`

Substitute -5 for x

⇒
`\sf{f(-5)=2(-5)^2-5}`

⇒
`\sf{f(-5)=2*25-5}`

⇒
`\sf{f(-5)=50-5}`

⇒
`\sf{f(-5)=45}`

Therefore, f(-5) = 45.

Answer 2

To find the value of f(-5) for the function f(x) = 2x^2 - 5, simply substitute -5 for x in the expression:

f(-5) = 2(-5)^2 - 5

Now, calculate the value:

f(-5) = 2(25) - 5

f(-5) = 50 - 5

f(-5) = 45

So, f(-5) = 45.