SOLUTION
Given the question in the question tab, the following are the solution steps to answer the question.
STEP 1: Write the given expression
[tex]3x-4xy^2[/tex]STEP 2: Substitute the given values for x and y into the expression.
[tex]\begin{gathered} x=-1,y=2 \\ 3x-4xy^2=3(-1)-4(-1)(2^2) \\ \Rightarrow-3-(4\times-1\times4) \\ \Rightarrow-3-(-16) \\ -\times-=+ \\ \Rightarrow-3+16 \\ \Rightarrow13 \end{gathered}[/tex]Hence, the evaluation of the exponent expression gives 13
