Question

-3х2+8х-5=0 помогите

Answer 1

Решение:

-3х²+8х-5=0

a= - 3 b=8 c=-5

D= b²-4ac

D=8²-4*(-3) *(-5)=4

x1= (-b+√D):2a

x1=(-8+√4):2*(-3)=-6:(-6)

x1= 1.

x2=(-8-√4):2*(-3)=-10:(-6)

x2= 5/3

Ответ: x1=1;x2= 5/3

Answer 2

$-3x^{2} +8x-5=0;\\a=-3;b=8;c=-5;\\D=b^{2} -4ac=8^{2} -4*(-3)*(-5)=64-60=4;\\x_{1} =\dfrac{-b-\sqrt{D} }{2a} =\dfrac{-8-\sqrt{4} }{2*(-3)} =\dfrac{-8-2}{-6} =\dfrac{-10}{-6} =\dfrac{10}{6} =\dfrac{5}{3} =1\dfrac{2}{3} ;\\x_{2} =\dfrac{-b+\sqrt{D} }{2a} =\dfrac{-8+\sqrt{4} }{2*(-3)} =\dfrac{-8+2}{-6} =\dfrac{-6}{-6} =\dfrac{6}{6} =1.$

$Otvet:1;1\dfrac{2}{3} .$

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