Question

Ind.

Answer 1

Answer:

  D.  0.87, -1.54

Step-by-step explanation:

The easiest method I know is to let a graphing calculator show you the solutions. The graph shows solutions to be approximately -1.54 and 0.87.

Answer 2

Answer:

$x=-\frac{1-\sqrt{13} }{3} ,-\frac{1+\sqrt{13} }{3}$

$0.87, -1.54$

Step-by-step explanation:

$3x^2+2x-4=0$

Use the quadratic formula:

$x=\frac{-b+\sqrt{b^2-4ac} }{2a} ,\frac{-b-\sqrt{b^2-4ac} }{2a}$

$x=\frac{-2+\sqrt{2^2-4*3*-4} }{2*3} ,\frac{-2-\sqrt{2^2-4*3*-4} }{2*3}$

Simplify:

$x=\frac{-2+2\sqrt{13} }{6} ,\frac{-2-2\sqrt{13} }{6}$

$x=-\frac{1-\sqrt{13} }{3} ,-\frac{1+\sqrt{13} }{3}$