book Maths Puzzle Numerical Ability

Explain the conditions under which a quadratic equation can be solved using simple rearrangement versus using the Quadratic formula. Is there a way to decide, from the structure o

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book Other Question

h^2=-5h A box with a square base no top is to be made from a square piece of tin by cutting out a 3cm square from each corner and folding up the sides. If the box is to hold 48cm3, what size piece of tin should be used.