exam Maths Puzzle Numerical Ability

Use a special product formula to factor the perfect square trinomial.

81x^2-108x+36

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exam Other Question

At a lumber company, shelves are sold in 4 wood types, 3 different lengths and 3 differents widths. How many different types of shelves could be ordered? The area of a rectangle increased by 5 is equal to 40 decreased by 4 times the area. Let a stand for the area. Solve for a.