exam Maths Puzzle Numerical Ability

How can we best describe these terms:
x squared + 2x - 1

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exam Other Question

Solve x^2=50, x is a real number. Simplify as much as possible. If there is more than one solution, separate by commas add

7 square root of 5 - square root of 5 + 5 square root of 3 - 3square root of 3