Question

12 :tính

a)  (x-1)²

^{b)  (3-y)2}

^{c)   (x-\(\dfrac{1}{2}\)})²

Answer 1

a) \(\left(x-1\right)^2=x^2-2x+1\)

b) \(\left(3-y\right)^2=9-6y+y^2\)

c) \(\left(x-\dfrac{1}{2}\right)^2=x^2-x+\dfrac{1}{4}\)

Answer 2

`a) (x-1)^2 = x^2 - 2.x.1 + 1^2`

`=x^2 - 2x + 1`

`b) (3-y)^2 = 3^2 - 2.3.y + y^2`

`=9 - 6y +y^2`

`c)(x-1/2)^2 = x^2 - 2.x.1/2 + (1/2)^2`

`=x^2 - x + 1/4`

Answer 3

\(a\left(x-1\right)^2=x^2-2x+1\)

\(b\left(3-y\right)^2=9-6y+y^2\)

\(c\left(x-\dfrac{1}{2}\right)^2=x^2-x+\dfrac{1}{4}\)

Answer 4

\( (x-1^)2=x^2-2.x.1+1^2=x^2-2x+1\)

\( (3-y)^2=3^2-2.3.y+y^2=9-6y+y^2\)

\(\left(x-\dfrac{1}{2}\right)^2=x^2-2.x.\dfrac{1}{2}+\left(\dfrac{1}{2}\right)^2=x^2-1x+\dfrac{1}{4}\)