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Algebra Level 1

Solve for x x : 2 x 2 = 3 x 1 2x^{2}=3x-1

1 1 or 2 2 1 1 or 1 2 \frac{1}{2} 3 3 or 4 4 5 5 or 9 9

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2 solutions

Sravanth C.
Feb 12, 2015

if we transpose 3 x 1 3x - 1 we get, 2 x 2 3 x + 1 2x^2 - 3x + 1 = 2 x 2 2 x 1 x + 1 = 2x^2 - 2x - 1x + 1 = 2 x ( x 1 ) + 1 ( x 1 ) = 2x(x - 1) + 1 (x - 1) = ( x 1 ) ( 2 x 1 ) = (x - 1) (2x - 1) therefore we get two solutions x = 1 x = 1 and x = 1 / 2 x = 1/2

Also, please type your latex in in brackets form so that it becomes, you know that.....

2 x 2 = 3 x 1 2x^2=3x-1 can be written as

2 x 2 3 x + 1 = 0 2x^2-3x+1=0

Using the quadratic formula to solve for x, we get

x = 1 x=1

x = 1 2 x=\dfrac{1}{2}

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