Katlyn99
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
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Mertsj
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Do you know the quadratic formula?
Mertsj
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Look in you book. It's in there.
Mertsj
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Did you find it?
Katlyn99
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yes
Mertsj
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So in your equation, a = 1, b = 5, and c = -2
Just plug in those numbers in place of the letters.
Mertsj
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\[x=\frac{-5\pm \sqrt{5^2-4(1)(-2)}}{2(1)}\]
Mertsj
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Does yours look like that so far?
Katlyn99
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yes
Mertsj
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\[x=\frac{-5\pm \sqrt{33}}{2}\]
Mertsj
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Oh gees. They gave the answers in decimal form so now we need a calculator. Do you have one handy?
Katlyn99
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yes
Mertsj
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\[\frac{-5+\sqrt{33}}{2}=.37\approx .4\]
\[\frac{-5-\sqrt{33}}{2}=-5.37\approx -5.4\]
Mertsj
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Is that what you got?
Katlyn99
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yes
Mertsj
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Good job!!
Katlyn99
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Thanks:)
Mertsj
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you're welcome