expand:- x^2 + y^2 + z ^2
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Answered by
1
x^2+y^2+z^2
=(x+y+z)^2
=x^2+y^2+z^2+2xy+2yz+2zx-2 (xy+yz+xz)
=(x+y+z)^2
=x^2+y^2+z^2+2xy+2yz+2zx-2 (xy+yz+xz)
faizysuri:
Thats not the way it should be solved .
Answered by
1
(x+y+z)² = x²+y²+z²+2xy+2yz+2zx
=> x²+y²+z² = (x+y+z)² - 2(xy+yz+zx)
=> x²+y²+z² = (x+y+z)² - 2(xy+yz+zx)
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