Question

if f(x)=x^2-5x+7. evaluate f(2) - f(1)​

Answer 1

Answer:

f(x) = x² - 5x + 7

f(1) = 1² - 5(1) + 7

= 1 - 5 + 7

= 8 - 5

f(1) = 3

f(2) = 2² - 5(2) + 7

= 4 - 10 + 7

= 11 - 10

f(2) = 1

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

f(2) - f(1) = -2