Question

1) (\(\dfrac{1}{2}\)x-5)(\(\dfrac{1}{2}\)x+5)-(x-4)(\(\dfrac{1}{4}\)x+3)=12 

Mng giúp mk câu này nha. Cảm ơn bạn nhiều 

Answer 1

`a, (1/4x^2 - 25) - 1/4x^2 + x - 3x + 12 = 12`

`-25 = 2x`

`x = -25/2`.

Answer 2

`(1/2x-5)(1/2x+5) -(x-4)(1/4x+3) =12`

`=> 1/4x^2 -25 - ( 1/4x^2 -x +3x -12) =12`

`<=> 1/4x^2 -25 -x^2 -3x +x+12 -12 =0`

`<=>-2x -25 =0`

`<=> -2x = 25 `

`<=> x = -25/2