Quadratic equation : দ্বিঘাত সমীকরণ; বর্গীয় সমীকরণ;
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Appropriate Prepositions
Bask in(রোদ পোহানো): The boys and girls are basking in the sun right now.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.