exam Maths Puzzle Numerical Ability

Please help to :

Evaluate

a^2 - b^3(a - b) if a = 1/3 and b = - 1/2

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exam Other Question

Story Problem:
An isosceles right triangle with legs of length "a".
I need to write a formula in simplified radical form for the length of the hupotenuse "c" in terms of "a" find two numbers whose sum is 12 and whose difference between their squares is 48.