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If x : a = y : b = z : c,then show that : `(a^2+b^2+c^2)(x^2+y^2+z^2) =(ax+by+cz)^2`.

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If x : a = y : b = z : c , then prove that (a^(2) + b^(2) + c^(2))(x^(2) + y^(2) + z^(2)) = (ax + by + cz)^(2)

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If x/a = y/b = z/c , then show that (x^(2)-yz)/(a^(2)-bc) = (y^(2)-zx)/(b^(2) - ca) = (z^(2)-xy)/(c^(2)-ab)

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UNITED BOOK HOUSE-QUESTION PAPER 2018-Exercise
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