book Maths Puzzle Numerical Ability

How do you solve x-y2(x0-y)?

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book Other Question

Find the perimeter of a right triangle with one side 2cm and the hypotenuse 7cm. How does a term differ from a factor?

Identify terms and factors in these examples: 5xy, x2 + 2y + 1, (x + y)(x - y)

e.g. 7ab is a term; 7, a, and b are factors)