Question

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Answer 1

Answer:

If f(x)=xsquare- 5x + 1 , then the value of f(2) + f(- 1)

is

2

f(x) = x ^ 2 - 5x + 1

f(2) = (2) ^ 2 - 5(2) + 1

f(2) = 4 - 10 + 1

f(2) = - 6 + 1

f(2) = - 5

f(-1)=(-1)^2-5(-1)+1

f(- 1) = 1 + 5 + 1

f(- 1) = 7

f(2) + f(- 1) = - 5 + 7 = 2

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Answer 2

Answer:

f(2) + f(-1)  = 2

Step-by-step explanation:

It is given that,

f(x) = x² - 5x + 1

We have to find the value of f(2) + f(-1)

f(2) means put x = 2 in the above equation.

f(2) = 2² - (5 × 2) + 1

= 4 - 10 + 1 = 5 - 10 = -5

f(2) = -5

f(-1) = (-1)² - [5 × (-1)] + 1

= 1 - (-5) + 1 = 1 + 5 + 1 = 7

f(-1) = 7

f(2) + f(-1) = -5 + 7 = 2

∴ f(2) + f(-1)  = 2