exam Maths Puzzle Numerical Ability

If the length of the side of a square is increased by 6 units, the area is multiplied by 4. Find the original side length.

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exam Other Question

I know that it is possible to add two polynomianls each of degree 3, and have the sum be a polynomial of degree 2, what I need is to see an example of this please. Thank you Simplify the following expression. Give your answer using only positive values for the exponents.
(2x^-3)^4(3x^5)^-2