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prove that 1/3[2 2 1
-2 1 2
1 -2 2] is orthogonal​

By Amelia

prove that 1/3[2 2 1
-2 1 2
1 -2 2] is orthogonal​

About the author
Amelia


Construct a quadrilateral ABCD, where AB = 4cm, BC = 5cm, CD = 6.5cm and angleB = 105°
and angleC = 80°​

If the sum of roots of quadratic equation a^2+bx+c =0 is equal to the square of the reciprocal then prove that 2a^2c= a^2b+b^2a

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