Question

(x-1)^2-14=(x+2)(x-2)-8x

Answer 1

`(x-1)^2-14=(x+2)(x-2)-8x`

`<=>x^2-2x+1-14=x^2-4-8x`

`<=>(x^2-x^2)-(2x-8x)=-4-1+14`

`<=>6x=9`

`<=>x=3/2`

Vậy `S={3/2}`.

 

Answer 2

\(\Leftrightarrow x^2-2x+1-14=x^2-4-8x\)

\(\Leftrightarrow6x=9\Leftrightarrow x=\dfrac{3}{2}\)

Answer 3

(x - 1)² - 14 = (x + 2)(x - 2) - 8x

<=> x² - 2x + 1 - 14 = x² - 4 - 8x

<=> x² - x² - 2x + 8x + 1 - 14 + 4 = 0

<=> 6x - 9 = 0

<=> 3(2x - 3) = 0

<=> 2x - 3 = 0

<=> 2x = 3

<=> x = \(\dfrac{3}{2}\)