Question

dada a função f(x)= 4x²-5+2,calcule:
a) f(-3)=
b) f(2)=

dada a função g(x)=x²+3x-4,calcule:
g (1/2) -g(2)

ME AJUDEM POR FAVOR

Answer 1

f(x) = 4x² - 5x + 2 
f(-3) = 4.(-3)² - 5.(-3) + 2
f(-3) = 4.9 + 15 + 2
f(-3) = 36 + 15 + 2
f(-30 = 53
------------------------------------------------------------------------------------------
f(x) = 4x² - 5x + 2
f(2) = 4.2² - 5.2 + 2
f(2) = 4.4 - 10 + 2
f(2) = 16 - 10 + 2
f(2) = 8
----------------------------------------------------------------------
g(x) = x² + 3x - 4
g(1/2) = ( 1/2 )² + 3.(1/2) - 4/1
g(1/2) = 1/4 + 3/2 - 4/1
g(1/2) = 1/4 + 6/4 - 16/4         mmc = 4
g(1/2) = - 9/4

g(x) = x² + 3x - 4
g(2) = 2² + 3.2 - 4
g(2) = 4 + 6 - 4
g(2) = 8
                          
g(1/2) - g(2) = - 9/4 - 8/1
g(1/2) - g(2) = - 9/4 - 32/4         mmc = 4
g(1/2) - g(2) = - 41/4