Question

factorise x to the power of 4 - 81

Answer 1

Answer:

(x²)²-81

(x²)²-9²

using identity (a+b)*(a-b)=a²-b²

(x²-9)(x²+9)=0

x=±3

Step-by-step explanation:

i hope its right

:)

Answer 2

the perimeter of papallelogram is 110cm one of its side is greater than order by 15cm. find the length of all sides