Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Ta có:\(x^2-4\)
\(=x^2-2^2\)
\(=\left(x-2\right)\left(x+2\right)\)
\(x^2-4\)
\(=x^2-2^2\)
\(=\left(x-2\right)\left(x+2\right)\)
\(=x\left(\frac{x^2}{4}+x+1\right)=x\left(\frac{x}{2}+1\right)^2\)
\(x^2+7x+6\)
\(=x^2+x+6x+6\)
\(=x\left(x+1\right)+6\left(x+1\right)\)
\(=\left(x+1\right).\left(x+6\right)\)
\(x^2+3x+2\)
\(=x^2+x+2x+2\)
\(=x\left(x+1\right)+2\left(x+1\right)\)
\(=\left(x+1\right)\left(x+2\right)\)
\(x^2+2x+1\)
\(=x^2+2.x.1+1^2\)
\(=\left(x+1\right)^2\)
@@@@@
x2 - 3x + 2
= x2 - x - 2x + 2
= x.(x - 1) - 2.(x - 1)
= (x - 1).(x - 2)
Ủng hộ mk nha ^-^
\(x^2-3x+2\)
\(=x^2-x-2x+2\)
\(=x\left(x-1\right)-2\left(x-1\right)\)
\(=\left(x-1\right)\left(x-2\right)\)
y2 + 3y + 2
= y2 + y + 2y + 2
= (y2 + y) + (2y + 2)
= y(y + 1) + 2(y + 1)
= (y + 1) (y + 2)
t i c k nha!! 64564645645676576876879798707896473762463464576576876689
\(y^2+y+2y+2\)
\(=y\left(y+1\right)+2\left(y+1\right)\)
\(=\left(y+1\right)\left(y+2\right)\)
\(x^5+x^4+2\)
\(=x^5+x^4+x^2-x^2+1+1\)
\(=\left(x^5-x^2\right)+\left(x^4+x^2+1\right)\)
\(=\left(x^5-x^2\right)+\left(x^4+2x^2-x^2+1\right)+1\)
\(=x^2\left(x^3-1\right)+\left(x^4+2x^2-x^2+1\right)+1\)
\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(\left(x^2+1\right)^2-x^2\right)+1\)
\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+1+x\right)\cdot\left(x^2+1-x\right)+1\)
\(=\left(x^3-x^2\right)\left(x^2+x+1\right)+\left(x^2+1+x\right)\cdot\left(x^2+1-x\right)+1\)
\(=\left(x^2+x+1\right)\left(x^3-x^2+x^2+1-x\right)+1\)
\(=\left(x^2+x+1\right)\left(x^3+1-x\right)+1\)
\(x^2-4=\left(x-2\right)\left(x+2\right)\)
(x-2)(x+2)
đúng ko ạ
\(x^2-4\)
\(=x.x-2.2\)
\(=x^2-2^2\)
Áp dụng hằng đẳng thức số 3 :
Ta có : \(\left(x+2\right).\left(x-2\right)\)
\(x^2-4\)
\(=x^2-2^2\)
\(=\left(x-2\right)\left(x+2\right)\)
x2 - 4 = x2 - x2 = (x+2)(x-2)
thế này ak
\(x^2-4=x^2+2x-2x+4=x\left(x+2\right)-2\left(x+2\right)=\left(x-2\right)\left(x+2\right)\)
x2-4
=x2-22
=(x-2)(x+2)
x2-4=x2-22=(x-2)(x+2)
\(x^2-4=x^2-2^2=\left(x+2\right)\left(x-2\right)\)
bài này có 2 phương án :
1.x2-4 có kết quả : \(\frac{1}{x^2}\)
2. x2 - 4 có kết quả (x-2)(x.2)
x^2 - 4= x^2-2x+2x-4=x(x-2)+2(x-2)=(x+2)(x-2)
\(x^2-2^2\)
\(=x^2-4\)
\(=\left(x-2\right)\left(x+2\right)\)
(x+2)(x-2)