Question

$x {}^{2} - 5x - 12 = 6$
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Answer 1

Объяснение:

$x^2-5x-12=6$

$x^2-5x-12-6=0$

$x^2-5x-18=0$

$a=1;b=-5;c=-18$

$D=b^2-4ac$

$D=(-5)^2-4*1*(-18)=25+72=97$

$x_{1,2}=\frac{-b^+_-\sqrt{D}}{2a}$

$x_{1,2}=\frac{-(-5)^+_-\sqrt{97}}{2*1}=\frac{5^+_-\sqrt{97}}{2}$