Divide through by whatever is multiplied on the squared term. Take half of the coefficient (don't forget the sign!) of the x-term, and square it. Add this square to both sides of the equation. Convert the left-hand side to squared form, and simplify the right-hand side.

bhai,jab pataa hai to puch kyon raha rah

this is an information in google

but still i dont know

Ask your teacher,he/she will better teach you

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