Question

Dada a função F R -R, definida por f (x) = - 4.x +3, determine o valor quando.
A) f(0)
b) f (-1)
c) f (1/4) - FRAÇÃO
D) F ( +2)

Answer 1

$f(x)=-4x+3 \\ \\ \boxed{f(0)=-4.0+3=0+3=0} \\ \\ \boxed{f(-1)=-4(-1)+3=4+3=7} \\ \\ \boxed{f\left (\frac{1}{4} \right)=-4\left (\frac{1}{4}\right)+3=-1+3=2} \\ \\ \boxed{f(2)=-4.2+3=-8+3=-5}$

Answer 2

Observe
$f(x)=-4x+3$

a) $f(0)=-4\cdot0+3=0+3=3$
b) $f(-1)=-4\cdot(-1)+3=4+3=7$
c) $f(\frac{1}{4})=-4\cdot\frac{1}{4}+3=\frac{-4}{4}+3=-1+3=2$
d) $f(2)=-4\cdot2+3=-8+3=-5$