book Maths Puzzle Numerical Ability

factorise x to the power of 2 + 2x + 1 - y to the power of 2

please help in solving question

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book Other Question

Solution A is 30% alchol and Solution B is 75% alchol. How much of each should be used to in order to make 100 liters of a solution that is 50% alchol? Ineed ur help on binomils