Question

(+ 3 $\overline { \mathrm { b } }$– ). {(–$\overline { \mathrm { b } }$) × (–$\overline { \mathrm { b } }$–)} equals

• A. 4 [$\overline { \mathrm { b } }$]
• B. 2 [$\overline { \mathrm { b } }$]
• C. – 4 [$\overline { \mathrm { b } }$]
• D. –2 [$\overline { \mathrm { b } }$]

Answer 1

Answer: (A)

4 <img src="https://cdn.pureessence.tech/canvas_577.png?top_left_x=335&top_left_y=0&width=225&height=300" style="width:0.125in;height:0.17361in" />$\overline { \mathrm { b } }$<img src="https://cdn.pureessence.tech/canvas_74.png?top_left_x=598&top_left_y=900&width=225&height=300" style="width:0.125in;height:0.17361in" />

Answer 2

(+ 3$\overline { \mathrm { b } }$– ). {(– $\overline { \mathrm { b } }$) × (–)}

= – (+ 3$\overline { \mathrm { b } }$) . {×– $\overline { \mathrm { b } }$× }

= .($\overline { \mathrm { b } }$× ) – 3$\overline { \mathrm { b } }$. (× )

= [$\overline { \mathrm { b } }$] + 3[$\overline { \mathrm { b } }$]= 4 [$\overline { \mathrm { b } }$]