Question

se f (x) = x² - x, quanto vale f (-1/2)?

Answer 1

$f(x)= x^{2} -x$

$f(- \frac{1}{2}) =(- \frac{1}{2} )^2-(- \frac{1}{2} )$

$f(- \frac{1}{2} )= \frac{1}{4}+ \frac{1}{2}$

$f(- \frac{1}{2} )= \frac{1+2}{4}$

$f(- \frac{1}{2} )= \frac{3}{4}$

Answer 2

f(x)=x²-x
f(-1)=(-1)²-(-1)=1+1
f(-1)=2


f(2)=2⁴-2=16-2
f(2)=14