Question

The area of a rectangular rug is given by the trinomial r^2-4r-77. What are the possible dimensions of the rug? Use factoring.
The length and width of the rectangle are __?

Could someone PLEASE explain what I'm supposed to do?
@dumbcow

Answer 1

Area = len*width

r^2 -4r -77 = (r + ?)(r + ?)

To factor this, find 2 num that multiply to -77 and add to -4

Answer 2

Thank you @dumbcow!