23-09-2017
Mathematics

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Let a and b be the solutions of the quadratic equation $2x^2 - 8x + 7 = 0. Find 1/(2a)+(1/2b).

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23-09-2017

Hello,

[tex]2x^2-8x+7=0\\ x^2-4x+ \frac{7}{2} =0\\ So\ a+b=4\ and\ \frac{a+b}{2} =2\ (x^2-(a+b)x+a*b=(x-a)(x-b)\ )[/tex]

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