A rectangular region is removed from another rectangular region to create the shaded region shown below. Find the area of the shaded region.

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

the one below it is a function