Write 4 as a sum (8h-3j)^2+2
Use a m+n=a m•a n to expand the expression
(8h-3j)^2 x (8h-3j)^2
Use (a-b)^2= a^2... -2ab+b^2 to expand the expression
(64h^2 - 48hj+ 9j^2)x(64h^2 - 48hj+ 9j^2)
Multiply the parentheses and after you get your answer you collect like terms.
Your answer should be:
4096h^4 - 6144h^3j + 3456h^2j^2 - 864hj^3 +81j^4
