Functionsss

Question

 

Is f(x)=2-5x^2 correct,

when f(root of 2)-f(1)= -5

Answer 1

Yes that is correct because

f(sqrt 2) = 2 - 5*2 = -8

f(1) = 2 - 5*1 = - 3

So f(sqrt 2) - f(1) = - 8 - (-3) = - 5

Answer 2

f(x) = 2 - 5x²

f(√2) = 2 - 5(2)

f(√2) = 2 - 10

f(√2) = -8

 

f(1) = 2 - 5

f(1) = -3

 

f(√2) - f(1)

-8 - (-3)

-8 + 3

-5