Question

Se f(x)= x² - 5x + 6,calcule:
a) f(2)
b) f(-2)

Answer 1

f(x)=x^2-5x+6
a) f(2)=2^2-5.2+6
f(2)=4-10+6
f(2)=-6+6
f(2)=0
b) f(-2)=(-2)^2-5.(-2)+6
f(-2)=4+10+6
f(-2)=14+6
f(-2)=20

Answer 2

f(x) = x² - 5x + 6a)
f(2) = 2² - 5.2 + 6
f(2) = 4 - 10 + 6
f(2) = 4 + 6 - 10
f(2) = 10 - 10
f(2) = 0
 
b)
f(-2) = (-2)² - 5.(-2) + 6
f(-2) = 4 + 10 + 6
f(-2) = 14 + 6
f(-2) = 20