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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x1=15,y1=9 x2=40,y2=? answer for one video club charges $25 to become a member and $2.50 to rent each video another charges no rental fee and $3.25 to rent each video how many videos must you rent to make the first club more economical