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Clearly if a, b and c are the lengths of the sides of an equilateral triangle then a^2 + b^2 + c^2 = ab + bc + ca. Is the converse true?

Consecutive Squares

The squares of any 8 consecutive numbers can be arranged into two sets of four numbers with the same sum. True of false?

Parabolic Patterns

The illustration shows the graphs of fifteen functions. Two of them have equations y=x^2 and y=-(x-4)^2. Find the equations of all the other graphs.

Minus One Two Three

Age 14 to 16
Challenge Level

Look at the two brackets for the factors that make the product. You are evaluating it for $x$ values of -1, -2, and -3 . Think what you could change systematically about those factors and see how it affects the size of the product for each of the three $x$ values.