A Variable Voltage in an Electrical Circuit Is Given By V

Multiple Choice

A variable voltage in an electrical circuit is given by $V = t ^ { 2 } - 9 t + 22$ , where t is in seconds. Find the values of t when the voltage V equals $4 \mathrm {~V}$ .

A) $t _ { 1 } = 2 , t _ { 2 } = 6 ,$
B) $t _ { 1 } = 3 , \quad t _ { 2 } = 6 ,$
C) $t _ { 1 } = 9 , t _ { 2 } = 16$
D) $t _ { 1 } = 4 , t _ { 2 } = 8$
E) $t _ { 1 } = 5 , t _ { 2 } = 9$