If A(a,2) , B (-3,-a) ,c (7,-5) are co linear .find n

1.	If A(a,2) , B (-3,-a) ,c (7,-5) are co linear .find n
Answer» Since the points are collinear, then,\xa0Area of triangle = 0{tex}\\frac { 1 } { 2 } \\left[ x _ { 1 } \\left( y _ { 2 } - y _ { 3 } \\right) + x _ { 2 } \\left( y _ { 3 } - y _ { 1 } \\right) + x _ { 3 } \\left( y _ { 1 } - y _ { 2 } \\right) \\right] = 0{/tex}{tex}\\frac { 1 } { 2 } [ x ( - 4 + 5 ) + ( - 3 ) ( - 5 - 2 ) + 7 ( 2 + 4 ) ] = 0{/tex}x + 21 + 42 = 0x = -63

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