Quadratic equation : দ্বিঘাত সমীকরণ; বর্গীয় সমীকরণ;
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Appropriate Prepositions
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Run short (কমতি পড়া) —I ran short of money.