Question

Dada a função f(x)= 3x² + 5x - 3 determine ; a) f ( 1 ) b ) f ( 1 / 2 ) c) f(-2) d) f(raiz 2 )

Answer 1

a)
f(1) = 3.1²+5.1-3
f(1) = 3+5-3= 5

b)
f(1/2) = 3.(1/2)²+5(1/2)-3
f(1/2) = 3.(1/4)+ (5/2) -3 = 3/4 + 5/2 - 3
f(1/2) = 13/4 - 3 = 1/4

c)
f(-2) = 3.(-2)²+5.2-3 = 3.4+10-3 = 12+10-3 = 19

d)
f(√2) = 3 (√2)² +5.√2 -3 = 3.2 + 5√2 -3 = 6 - 3 + 5√2
f(√2) = 3 + 5√2