Question

[______]
find the perimeter
length = 8x^4+5x^3
width = 2x^3-x

Answer 1

2(8x^4+7x^3-x)
i.e 16x^4+14x^3-2x

Answer 2

Perimeter = 2L + 2W
hence,
\[Perimeter = 2(8x ^{4} + 5x ^{3}) + 2(2x ^{3} - x)\]
\[Perimeter = 16x ^{4} + 10x ^{3} + 4x ^{3} - 2x\]
\[Perimeter = 16x ^{4} + 14x ^{3} - 2x\]