Question

If f (x) = 5 x 2 – 4x + 5, find the value of f (1) + f (–1) .

Answer 1

Answer. ATQ, f(1)+f(-1)+f(0)=6+14+5=25.

Step-by-step explanation:

I hope it helps you

Answer 2

Given

We have given f(x)= 5x²-4x+5

To Find

We have to find f(1)+f(-1)

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

Note : Any change in f(x) will cause a change in the function.

Now ,our function is f(x) and we have to find f(1) +f(-1) now compare the coefficient of f(x) with f(1 ) and f(-1) we find x=1 and x= -1

So,we have to find the value of f(x) at x=1 ,-1

at x= 1

=>f(x)= 5x²-4x+5

=>f(1)= 5(1)²-4(1)+5

=>f(1)=5-4+5

=>f(1)= 1+5=6

Therefore ,f(1) is 6

At x= -1

f(x)= 5x²-4x+5

f(-1)= 5(-1)²-4(-1)+5

f(-1)=5+4+5

f(-1)= 14

therefore, f(-1) is 14

Now,we have to find f(1)+f(-1)

f(1)+f(-1)= 6+14=20

Extra information=>

➥The above function is a quadratic equation as highest power is 2.

➥f(x)=y here ,f is the function and x is an input which gives output say 'y'.

➥We can find infinite number of output of f(x) by putting infinite number of values into f(x).