Question

Please Help!!
Suppose that the functions s and t are defined for all real numbers x as follows.
s(x)=x^3
t(x)=4x^2
Write the expressions for (s+t)(x) and (s-t)(x) and evaluate (s*t)(-1).

Answer 1

HINT:
\((s+t)(x) ~~=~~ s(x) + t(x)\),

\((s-t)(x) ~~=~~ s(x) - t(x)\)

and \((s\cdot t)(x) ~~=~~ s(x)\cdot t(x)\)