A rectangle's area is $x^2-x-72$ . What are possible dimensions of the rectangle?

Question

5060 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-05-31T21:34:34

$(x-9)(x+8)$

Let's see if we can factor $x^2-x-72$ . What two numbers sum up to $-1$ and have a product of $-72$ ?

After some trial and error, we arrive at $-9$ and $8$ . Thus, we now have

$(x-9)(x+8)$

Where these can represent the sides of the rectangles.

Hope this helps!

A rectangle's area is x^2-x-72x^2-x-72. What are possible dimensions of the rectangle?