Function: f(t)=2t²+4find f(-x)
Yes that is right - the brackets are not needed.
It is because
$$(-x)^2=(-x)*(-x)=(x)^2=x^2$$
You just have to replace all the ts with -x
$$\begin{array}{rll} f(-x)&=&2(-x)^2+4\\\\ &=&2x^2+4\\\\ \end{array}$$
thank you!!
you are most welcome.
if it were just f(x) and not f(-x) would the end result still be 2(x)²+4?
