The answer should be 2x-5
First - 8
second - 4
third - 12
fourth - 9
<u>Answer:</u>
<h3>(

) x (

) </h3>
<u>Step-by-step explanation:</u>
To find the area of a rectangle, we have to multiply the length with the width.
In the question, the given length is 'x' and the width given is 'x +7'
So, the area would be
(
) x (
)
The area = 
So, the equation to find the area of such a rectangle would be:-
(
) x (
)
If x +23 = 9, then, x = 9-23.
So x = -14
Colors of light are each bent a different amount because each color has particular wavelength