[tex]\\ \sf\longmapsto b^2=-169[/tex]
[tex]\\ \sf\longmapsto b=\sqrt{-169}[/tex]
[tex]\\ \sf\longmapsto b=\sqrt{-(13)^2}[/tex]
[tex]\\ \sf\longmapsto b=13i[/tex]
Answer:-13
Step-by-step explanation:
