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Complete the square and solve the equation x^2+3x+...=0
Solution
x^2+3x= 0
To complete the square and solve for x.
We add (3/2)^2 to both sides so that x+3x+(3/2)^2 becomes a perfect square.
x^2+3x+(3/2)^2 = (3/2)^2.
(x+3/2)^2 = (3/2)^2.
We take the square root:
(x+3/2) = +3/2, x +3/2 = -3/2
x+3/2 = 3/2 gives x= 0.
x+3/2 = -3/2 gives x= -3/2-3/2 = -3.
So x= 0, or x= -3.

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Complete the square and solve the equation x^2+3x+...=0Solution.pdf

  • 1. Complete the square and solve the equation x^2+3x+...=0 Solution x^2+3x= 0 To complete the square and solve for x. We add (3/2)^2 to both sides so that x+3x+(3/2)^2 becomes a perfect square. x^2+3x+(3/2)^2 = (3/2)^2. (x+3/2)^2 = (3/2)^2. We take the square root: (x+3/2) = +3/2, x +3/2 = -3/2 x+3/2 = 3/2 gives x= 0. x+3/2 = -3/2 gives x= -3/2-3/2 = -3. So x= 0, or x= -3.