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Mathematics
OpenStudy (anonymous):

Prove:

OpenStudy (anonymous):

OpenStudy (anonymous):

Using Sarus's rule, you get (a+x)(a+y)(a+y)+yzx+zxy-z(z+y)x-yx(a+z)-(a+x)zy, and when you calculate this and take a^2 out, your proof is done:)

OpenStudy (anonymous):

Whats Sarus's rule ?

OpenStudy (anonymous):

It's a rule for determining a 3x3 determinant. You just write first 2 columns after the third, and add multiplied elements on the diagonals from left to right, and substract multiplied element on the diagonals from right to left.

OpenStudy (anonymous):

Ok Thank you

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