1.

Suppose a,b,c are three real numbers, such that the quadratic equation x²-(a+b+c)x + (ab+bc+ac) = 0has roots of the form d±ie where d>0 and e≠0 are real numbers [ here i = √-1 ]. Show that (I) the numbers a, b and c are all positive.(II) the numbers √a , √b, √c, form the sides of triangle.

Answer» Suppose a,b,c are three real numbers, such that the quadratic equation
x²-(a+b+c)x + (ab+bc+ac) = 0
has roots of the form d±ie where d>0 and e≠0 are real numbers [ here i = √-1 ].
Show that
(I) the numbers a, b and c are all positive.
(II) the numbers √a , √b, √c, form the sides of triangle.


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