b(3;-2), c(-7;2),
a = -b + 1/2*c = -(3; -2) + 1/2*(-7; 2) = (-3; 2) + (-3.5; 1) = (-3 - 3.5; 2 + 1) = (-6.5; 3)
|a| = √((-6.5)² + 3²) = √(42.25 + 9) = √51.25 = √205/2
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b(3;-2), c(-7;2),
a = -b + 1/2*c = -(3; -2) + 1/2*(-7; 2) = (-3; 2) + (-3.5; 1) = (-3 - 3.5; 2 + 1) = (-6.5; 3)
|a| = √((-6.5)² + 3²) = √(42.25 + 9) = √51.25 = √205/2