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Harold Edwards
if the distance between two points A(x,-4) and B(-8,2) is 10 then find A
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Janusz
办美国文凭加拿大文凭澳洲文凭英国文凭学位证毕业证成绩单
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Wendy Ye
![Prove that |[1 +a^2 -b^2, 2ab, -2b],[2ab, 1-a^2 +b^2, 2a],[2b, -2a, 1-a^2 -b^2]| = (1 + a^2 + b^2)^3](http://i.ytimg.com/vi/B7UwIYXEcX8/mqdefault.jpg "Prove that |[1 +a^2 -b^2, 2ab, -2b],[2ab, 1-a^2 +b^2, 2a],[2b, -2a, 1-a^2 -b^2]| = (1 + a^2 + b^2)^3")
![If a, b, c are in A. P. then determinant |[x+2, x+3, x+2a],[x+3, x+4, x+2b],[x+4, x+5, x+2c]|](http://i.ytimg.com/vi/bxjhfOHzYjE/mqdefault.jpg "If a, b, c are in A. P. then determinant |[x+2, x+3, x+2a],[x+3, x+4, x+2b],[x+4, x+5, x+2c]|")
![If A= [[2,-1],[-1,2]], B= [[1,4],[-1,1]], Is (A+B)^2 = A^2 + 2AB + B^2 ?](http://i.ytimg.com/vi/KmuSH-fjLaU/mqdefault.jpg "If A= [[2,-1],[-1,2]], B= [[1,4],[-1,1]], Is (A+B)^2 = A^2 + 2AB + B^2 ?")
