Question

seja a função f(x)=2x² +3x+9,calcule A)f(1)+f(3) B) f(4)- f(1)

Answer 1

f(x)=2x²+3x+9
f(1)= 2.1² + 3 .1 +9
f(1) = 2+3+9 = 14

f(3)= 2. 3² +3 . 3 +9
f(3)= 18+9+9 = 36

f(4)= 2 . 4² + 3 . 4 + 9
f(4)= 32 + 12+ 9 = 53

A) f(1) + f(3) =
    14+36 = 50

b) f(4) - f(1) =
   53 - 14 = 39