SOLUTION: use the quadratic formula to solve the equation to the exact value or round to two decimal places. x2+x=5

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: use the quadratic formula to solve the equation to the exact value or round to two decimal places. x2+x=5      Log On


   

Question 1121887: use the quadratic formula to solve the equation to the exact value or round to two decimal places. x2+x=5
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
x^2 +x -5 = 0
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the standard form of a quadratic equation is
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ax^2 +bx +c = 0
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for this problem a=1, b=1, c=-5
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the quadratic formula is
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x = (-b + or - sqrt(b^2-4ac))/2a
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x = (-1 +sqrt(1^2 -4(1)(-5))/2(1) = 1.7912 approximately 1.79
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x = (-1 -sqrt(1^2 -4(1)(-5))/2(1) = -2.7913 approximately -2.79
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