if a2 + b2 + c2 = 2(3a -5b -6c)-70 , then a-b-c = ?
a2 + b2 + c2 = 2(3a -5b -6c)-70 So a2 + b2 + c2 -2×3a +2 ×5b + 2×6c +70 = 0 a2 -2×3a +9 + b2 +2 ×5b+25 +c2 +2×6c+36 = 0 So (a-3)2 +(b+5)2+(c+6)2 = 0 As we know that if x2 + y2 +z2 = 0 then x=y=z = 0 So here a-3 = 0 so a =3; b +5 = 0 so b = -5 And c+6 =0 so c = -6 So now a-b-c = 3-(-5)-(-6) = 3+5+6 = 14
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