exam Maths Puzzle Numerical Ability

The area of a rectangle of length x is given by 3x2 + 5x. Find the width of the rectangle (This requires knowledge of the formula for area of a rectangle)???

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exam Other Question

Solve the equation by completing the square

x^2 - 14x + 24 = 0 I really need some help. the square root of 3x^4y^3 divided the sqaure root of 9xy^5 The only thing I thought to do was to put the problems vertical instead of horizontal and then get the square root of 9. Im not sure what the next step is.