Question

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Answer 1

f(x) = 0 ->

f(x) = x² - (m+1)x + m = 0

x1 + x2 - x1x2 = 1

x1 + x2 = -b/a = S

x1x2 = c/a = P

-b/a - c/a = (-b-c)/a

a = 1

b = -m - 1

c = m

(m + 1 - m )/ 1 = 1 -> x1 + x2 - x1x2 = 1