Which expression is equivalent to this polynomial expression? (8x²y²-9x²y+9y) - (6x²y-xy²+4y)
A. -7x²y²+xy²+5y
B. 8x²y²-3x²y-xy²+13y
C. -7x²y²-xy²+13y
D. 8x²y²-15x²y+xy²+5y

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.

josh is incorrect

x= 7 and x= -1

step 2 is wrong and honestly first step is not needed, you just need to figure out the factors

i know its wrong because if you plug in the solutions josh found, they do not work (in the original equation)

x^2 -6x -7 = 0

(x-7) (x+1) = 0

x-7=0 x+1=0

x= 7 x= -1

y=2x2-2+3

or it could be

y=2x2+1