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Solve for x. use the completing the square method. x^2+8x=5

Solve for x. use the completing the square method. x^2+8x=5
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5 votes
Solve for x. use the completing the square method.

x^2+8x=5

User Andrucz
by
8.7k points

1 Answer

2 votes

x^2+8x=5


x^2+8x + ( (8)/(2) )^2 =5 + ((8)/(2) )^2


x^2+8x + (4)^2 =5 + (4)^2


(x+ 4)^2 =21


x+ 4 = \pm √(21)


x = √(21) - 4 \ or \ x= -√(21) - 4


x = 0.58 \ or \ x= -8.58

User MadJlzz
by
8.4k points
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