book Maths Puzzle Numerical Ability

How to solve this quadratic equation by completing the square

x^2 + 6X - 7 = 0

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You want to have $40,000 to buy a new boat in six years. How much do you have to save at the end of each year to reach this goal if you earn
1.Why do you factor a quadratic equation before you solve?.


2. What is the best and most simplest way to expalain the answer to a rational equation using a step by step proces