Question

a ) x² -5 x+8 Para x= 2


b ) x²-5 x+8 Para x= -2

Answer 1

a)f(x) = x² - 5x +8

x = 2

f(2) = 2² - 5*2 + 8
f(2) = 4 - 10 + 8
f(2) = 2

b) f(x) = x² - 5x +8

x = -2

f(-2) = (-2)² - 5(-2) +8
f(-2) = 4 + 10 +8
f(-2) = 22