Question

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Answer 1

Answer:

-6/5

For a general quadratic equation

$a {x}^{2} + bx + c = 0$

$\alpha + \beta = - b \div a \\ \alpha \beta = c \div a$

here

$\alpha + \beta = - 2 \div 1\\ \alpha \beta = 5 \div 1$

so let alpha+beta=S

alpha×beta=P

then (S^2 -2P)/P

=(4-2×5)/5= -6/5