Question

a,(x-y)² - 2x - 15=0

b,x² - 2x - 35=0

Answer 1

b: x^2-2x-35=0

=>(x-7)(x+5)=0

=>x=7 hoặc x=-5

a: Sửa đề; (x-1)^2-2x-15=0

=>x^2-2x+1-2x-15=0

=>x^2-4x-14=0

=>\(x=2\pm3\sqrt{2}\)

Answer 2

`a, (x-y)^2 -2x-15=0`

`<=> (x-y)^2  = 2x +15`

`<=>x-y = +-sqrt(2x+15)`.

`<=> y= x +-sqrt(2x+15)`.