Book Maths Puzzle Algebra

How to sulve quadratic equations using the cmopleting the square method ?
Example: 2x square + 5x +3

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A bicycle was sold for 30% more than what was originally paid for it. It was sold for $104. How much was the bike originally bought for?
The horsepower that a rotating shaft can safely generate varies jointly with the cube of its diameter and its speed in revolutions per minute. A shaft with a 3-inch diameter turni