The area of a rectangle of length x is given by 3x^2+5x find the width of the rectangle

a=l*w
=x*(3x+5)
I stoped here I am not sure if I am correct i was taken the 3x+5 as the width and x as the length but i am not sure if the 3x+5 should be the area and divid by x the length could some one get me on the right track please

if the area is 3x^2 + 5x and the length is x, then the width must be the area divided by the length.
that is: 3x^2 + 5x ÷ x
which is indeed 3x + 5 like you had.

check: multiply x by 3x+5 .....

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