ANSWER
[tex]\begin{gathered} -5-3i \\ a=-5;b=-3 \end{gathered}[/tex]EXPLANATION
We want to evaluate the expression:
[tex](-1-6i)-(4-3i)[/tex]To do this, we collect like terms (real part and complex part) and then simplify the expression:
[tex]\begin{gathered} -1-6i-4+3i \\ \Rightarrow-1-4-6i+3i \\ \Rightarrow-5-3i \end{gathered}[/tex]The real number a is -5 and the real number b is -3.
