Question

Can someone walk me through this question? A box has a volume geven by y³+y²-56y. Whats the demensions of the box? Use Factoring.

Answer 1

First factor out a y, because that is a common factor of all three terms:
y(y²+y-56)

Then , you can factor the part between the brackets like this:

y(y ....)(y ....)

Now you have to find the numbers that go on the dots; call them a and b for now.
a+b=1 (because there is 1*y as middle term)
a*b=-56.

Can you think of what numbers these have to be?

Answer 2

-7x8

Answer 3

So the dementions would be y, y+8 and y-7? @ZeHanz

Answer 4

Yes, that is true!

Answer 5

Ok thanks!!