Solving Mathematical Problems of 20 15 Postgraduate Entrance Examination - Training Enrollment Network

Solving Mathematical Problems of 20 15 Postgraduate Entrance Examination

Let the abscissas of a and b be x 1 and x2 respectively,

Then x 1+x2 =-2a, x 1x2 = b,

SABC = 1/2 * 2 * | x2-x 1 | = 6，

So | x2-x 1 | = 6,

Square (x 1+x2)? - 4x 1x2=36，

That is (-2a)? - 4b=36，

So a? - b = 9 .

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