Question

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Answer 1

x2=12
b=10
x2=-24/-2=12
b=12-2=10

Answer 2

$D = \sqrt{b^2+96}$
$x = \frac{-b+ \sqrt{b^2+96} }{2} = -2$
$-b+ \sqrt{b^2+96} = -4$
$\sqrt{b^2+96} = b-4$
$b^2+96 = b^2-8b+16$
$8b = -80$
$b=-10$
$D = 100+96 = 14^2$
$x_{2} = \frac{10+14}{2} = 12$