exam Maths Puzzle Numerical Ability

The area of a rectangle of length x is given by 3x^2+5x. Find the width of the rectangle. Help please I do not understand this.

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exam Other Question

8=1-7x^2 I am having trouble obtain the correct answer for solving the following information:

F(x)= 2x^2 - 7x - 4

use the vertex and intercepts to sketch the graph of each quadratic f