Multiple. (2x- y) (3x + y)

6x^2-xy-y^2

Step-by-step explanation:

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We can use distributive properties 2 times.

First

(2x-y)(3x+y)

=2x(3x+y)-y(3x+y)

Then second time

=6x^2+2xy-3xy-y^2

Now combine like terms

=6x^2-xy-y^2

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answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.