Tan Daphne's answer to Syarifah's Secondary 4 E Maths Singapore question.
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Part A) 2u
Reason:
DO=OA=u
DA=DO+OA=2u
Part B) v-u
Reason:
OA+AB=OB
u+AB=v
AB=v-u
Part C) v+u
Reason:
EO+OA=EA
EO=OB= v
Part D) v-2u
Reason:
OCAB is a rhombus hence OC=AB
OA=u
AO=-u
AC=AO+OC
AC= -u+(v-u)= v-2u
Don’t forget to put vector sign when necessary!
Reason:
DO=OA=u
DA=DO+OA=2u
Part B) v-u
Reason:
OA+AB=OB
u+AB=v
AB=v-u
Part C) v+u
Reason:
EO+OA=EA
EO=OB= v
Part D) v-2u
Reason:
OCAB is a rhombus hence OC=AB
OA=u
AO=-u
AC=AO+OC
AC= -u+(v-u)= v-2u
Don’t forget to put vector sign when necessary!
Date Posted:
3 years ago
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