Finding my x!

Algebra Level 1

Solve for x x :

( x 3 ) 2 4 x 1 = 0 \large \dfrac{(x-3)^2-4}{x-1} = 0 .


The answer is 5.

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3 solutions

We have , ( x 3 ) 2 4 x 1 = 0 , where x 1 \frac{(x-3)^{2}-4}{x-1} =0 , \text{where } x \neq 1 which means, ( x 3 ) 2 4 = 0 ( x 3 ) 2 = 4 (x-3)^{2} - 4 =0 \Rightarrow (x-3)^2 = 4 x 3 = ± 2 x = 3 ± 2 x-3 = \pm 2 \Rightarrow x= 3\pm 2 which gives, x = 5 , 1 x=5,1 But x 1 x \neq 1 because then x 1 x-1 will be equal to 0 0 making the expression in and indeterminate form. So , x = 5 x=\boxed {5}

Here is my elementary solution:

( x 3 ) 2 4 x 1 = 0 \frac{(x-3)^2-4}{x-1}=0

( x 3 ) 2 2 2 x 1 = 0 \frac{(x-3)^2-2^2}{x-1}=0

( x 3 2 ) ( x 3 + 2 ) x 1 = 0 \frac{(x-3-2)(x-3+2)}{x-1}=0

x 5 = 0 x = 5 \Rightarrow x-5=0 \Rightarrow x=\boxed{5}

Atika Samiha
Aug 27, 2015

((x-3)^2-2^2)/(x-1)=0 =or,((x-5)(x-1))/(x-1)=o or,x=5

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