if A(5,3) ,B(11,-5) and C(12,y) are vertices of a right triangle right angled at C, then find the value of y
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On solving this equation
2y²-4y-16=0
y²-2y-8=0
(y²+2y)-(4y-8)=0
y(y+2)-4(y+2)=0
(y-4)(y+2)=0
y= 4 or y= - 2
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