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01-05-2018
Mathematics

contestada

Help please!
6x^2+2x-9=0
A 6.4, -8.4
B 1.1, -1.4
C -2.2, 2.8
D -1.1, -1.4

Respuesta :

02-05-2018

[tex]6x^2+2x-9=0\\\\a=6;\ b=2;\ c=-9\\\\\Delta=b^2-4ac\to\Delta=2^2-4\cdot6\cdot(-9)=220\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a};\ x_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\x_1=\dfrac{-2-\sqrt{220}}{2\cdot6}=\dfrac{-2-\sqrt{220}}{12}\approx-1.4\\\\x_2=\dfrac{-2+\sqrt{220}}{2\cdot6}=\dfrac{-2+\sqrt{220}}{12}\approx1.1[/tex]

Answer: B. 1.1; -1.4.

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