Solve 0.75x2+1.5x=4 by completing the square
First multiply all terms by 4/3:
x^2 + 2x = 16/3
Add 1 to both sides
x^2 + 2x + 1 = 1 + 16/3
This becomes
(x + 1)^2 = 19/3
There are two solutions:
A. x + 1 = sqrt(19/3) so x = -1 + sqrt(19/3)
B. x + 1 = -sqrt(19/3) so x = -1 - sqrt(19/3)
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