A rectangle has an area of 72 square units. The width of the rectangle is 9 units. The length of the rectangle is 2x + 4.

What is the rectangle's length?

Question

A rectangle has an area of 72 square units. The width of the rectangle is 9 units. The length of the rectangle is 2x + 4. 

What is the rectangle's length?

parthkohli · Answer

The area of a rectangle is length times breadth.

$ \color{Black}{\Rightarrow 9(2x + 4)  = 72}$

$ \color{Black}{\Rightarrow 2x + 4 = 72 \div 9}$

$ \color{Black}{\Rightarrow 2x + 4 = 8 }$

parthkohli · Answer

I don't know why we have $x$ here. But solving for $x$, you get $2x = 4$

$ \color{Black}{\Rightarrow x = 2}$

anonymous · Answer

these are my answers 6
7
8
9

anonymous · Answer

6
7
8
9

parthkohli · Answer

Well as I said, 2x + 4 = length = 8

anonymous · Answer

oh

ganpat · Answer

area for rect = l * b
l = 2x + 4
b = 9

72 = (2x +4) * 9
x = 2

Therfore, Length = 2(2) + 4 =  8