A = 3 b = 2 c= -5
D = b² - 4ac
D = 4+ 60 = 64
х1,2 = -b₊₋√D / 2a
x 1 = - 2 +√64 / 2 ×3 = -2 + 8 / 6 = 1
x 2 = -2 - 8 /6 ≈ -1,667
Ответ: х1 = 1, х2 = -1,667
Ответ:
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А + 5х = b + 2x
5x - 2x = b - a
3x = b - a
X = ( b - a ) / 3
X = 1/3( b - a )
-(-0,2)²= -0,04
-(-3)²*(-2)³= -9*-8=72