Can someone help me with this problem dealing with vectors?

If a = %26lt;3,1,2%26gt;, b = %26lt;-1,1,0%26gt;, %26amp; c= %26lt;0,0,-4%26gt;, show that a X (b X c) does not equal (a X b) X c

Can someone help me with this problem dealing with vectors?
a = (3,1,2)


b = (-1,1,0)


c = (0,0,-4)





bXc = 4i +4j


aX(bXc) = 8i +8j -16k





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aXb = -2i -2j +4k


(aXb)Xc = -32i +32j





i found that a X (b X c) does not equal (a X b) X c