Answer
-x$^4$-3x$^2$-4
Work Step by Step
(A+B)(A-B)=A$^2$-B$^2$
(x+(2+x$^2$))(x-(2+x$^2$))
(x)$^2$-(2+x$^2$)$^2$
x$^2$-(2$^2$+2(2)(x$^2$)+(x$^2$)$^2$)
x$^2$-4-4x$^2$-x$^4$
-x$^4$-3x$^2$-4
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