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

asked Apr 12, 2018 70.3k views

2 votes

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

Please help me!

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4 votes

Hello,

$2x^2-8x+7=0\\ x^2-4x+ (7)/(2) =0\\ So\ a+b=4\ and\ (a+b)/(2) =2\ (x^2-(a+b)x+a*b=(x-a)(x-b)\ )$

Jonghee Park answered Apr 18, 2018

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