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anonymous
 one year ago
Solve x2 + 8x − 3 = 0 using the completingthesquare method.
A.x = four plus or minus the square root of three
B.x = negative four plus or minus the square root of three
C.x = four plus or minus the square root of nineteen
D.x = negative four plus or minus the square root of nineteen
anonymous
 one year ago
Solve x2 + 8x − 3 = 0 using the completingthesquare method. A.x = four plus or minus the square root of three B.x = negative four plus or minus the square root of three C.x = four plus or minus the square root of nineteen D.x = negative four plus or minus the square root of nineteen

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1(x + 4)^2  16  3 = 0 can you see why i subtract 16 ?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1ok so to complete the square you first divide the coefficient of x in the original equation by 2 so here its +8 / 2 = +4 so we write (x + 4)^2  thats the square bit but if you expand this it comes to x^2 + 8x + 16. So to make it equal to x^2 + 8x we have to subtract 16

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay i dont undertand how there is a squaare root in the answer tho

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1as an identity in general form its is x^2 + bx = (x + (b/2)^2  ( b/2)^2

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1because we have a square in the equation (x + 4)^2 3  16 = 0 (x + 4)^2 = 19 taking square roots x + 4 = +/ sqrt 19
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