this is a simple question but its confused me
heres the question
f(x)= 2 - x^2 where x = -3
is it -7 or is it 11 im confused by the sign change
thanks..
$\displaystyle 3(3)=3+3+3=9$
$\displaystyle 3(-3)=-3-3-3=-9$
$\displaystyle (-3)(-3)=-[3(-3)]=opposite\ of\ subtract\ 3\ three\ times$
$\displaystyle which\ is\ add\ 3\ three\ times.$
$\displaystyle Hence\ (-3)(-3)=3(3)=9$
$\displaystyle 2-x^2=2-(-3)^2=2-(9)=-7$