SOLUTION: Given F(x)=x^2+2x-8 , Solve F(x) Using each method below: Show work please. 1). Solve by graphing. 2). Solve for factoring. 3). Solve by the quadratic formula Thanks

Algebra ->  Graphs -> SOLUTION: Given F(x)=x^2+2x-8 , Solve F(x) Using each method below: Show work please. 1). Solve by graphing. 2). Solve for factoring. 3). Solve by the quadratic formula Thanks      Log On


   

Question 1014422: Given F(x)=x^2+2x-8 , Solve F(x) Using each method below: Show work please.
1). Solve by graphing.
2). Solve for factoring.
3). Solve by the quadratic formula
Thanks!
Found 2 solutions by Boreal, stanbon:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
x^2+2x-8=0
Factors into (x+4)(x-2)=0; x=-4, 2
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quadratic
x=(1/2)(-2 +/- sqrt (4+32)=
(1/2) (-2+/-6)=(1/2)(-8) and (1/2)(4)=-4,2
=========
graph
graph%28300%2C200%2C-10%2C10%2C-10%2C10%2Cx%5E2%2B2x-8%29

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Given F(x)=x^2+2x-8 , Solve F(x) Using each method below: Show work please.
1). Solve by graphing.
graph%28400%2C400%2C-10%2C10%2C-10%2C10%2Cx%5E2%2B2x-8%29
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2). Solve by factoring.
(x+4)(x-2) = 0
x = -4 or x = 2
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3). Solve by the quadratic formula
x = [-2 +- sqrt(2^2-4*1*-8)]/2
x = [-2 +- sqrt(36)]/2
x = [-2+-6]/2
x = -4 or x = 2
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Cheers,
Stan H.
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