Question

Solve the following using the quadratic formula. Round to the nearest tenth, if necessary.

x2 + 5x - 2 = 0

{-2, 5}


{-5.4, 0.4}


{-1, 0.5}


No real solution

Answer 1

Do you know the quadratic formula?

Answer 2

Look in you book. It's in there.

Answer 3

Did you find it?

Answer 4

yes

Answer 5

So in your equation, a = 1, b = 5, and c = -2
Just plug in those numbers in place of the letters.

Answer 6

\[x=\frac{-5\pm \sqrt{5^2-4(1)(-2)}}{2(1)}\]

Answer 7

Does yours look like that so far?

Answer 8

yes

Answer 9

\[x=\frac{-5\pm \sqrt{33}}{2}\]

Answer 10

Oh gees. They gave the answers in decimal form so now we need a calculator. Do you have one handy?

Answer 11

yes

Answer 12

\[\frac{-5+\sqrt{33}}{2}=.37\approx .4\]
\[\frac{-5-\sqrt{33}}{2}=-5.37\approx -5.4\]

Answer 13

Is that what you got?

Answer 14

yes

Answer 15

Good job!!

Answer 16

Thanks:)

Answer 17

you're welcome