Question

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

Answer 1

`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=(-b-\sqrt\Delta)/(2a);\ x_2=(-b+\sqrt\Delta)/(2a)\\\\x_1=(-2-√(220))/(2\cdot6)=(-2-√(220))/(12)\approx-1.4\\\\x_2=(-2+√(220))/(2\cdot6)=(-2+√(220))/(12)\approx1.1`

Answer: B. 1.1; -1.4.