\(a^4+4b^4\). Phân tích đa thức thành nhân tử ✍
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a^4-4b^2\)
\(=\left(a^2\right)^2-\left(2b\right)^2\)
\(=\left(a^2-2b\right)\left(a^2+2b\right)\)
Bài làm
a4 - 4b2
= ( a2 )2 - ( 2b )2
= ( a2 - 2b )( a2 + 2b )
# Học tốt #
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=b^4-9a^2-4b^2+4=b^4-4b^2+4-9a^2\)
\(=\left(b^2-2\right)^2-9a^2\)
\(=\left(b^2-2+3a\right)\left(b^2-2-3a\right)\)
\(A=b^4-9a^2-4b^2+4\)
\(A=\left(b^2\right)^2-2.2.b^2+2^2-9a^2\)
\(A=\left(b^2-2\right)^2-\left(3a\right)^2\)
\(A=\left(b^2-2-3a\right)\left(b^2-2+3a\right)\)
_Hắc phong_
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =64x^4+16x^2y^2+y^4-16x^2y^2
=(8x^2+y^2)^2-(4xy)^2
=(8x^2+y^2-4xy)(8x^2+y^2+4xy)
b: =x^8+2x^4+1-x^4
=(x^4+1)^2-x^4
=(x^4-x^2+1)(x^4+x^2+1)
=(x^4-x^2+1)(x^4+2x^2+1-x^2)
=(x^4-x^2+1)(x^2+1-x)(x^2+x+1)
c: =(x+1)(x^2-x+1)+2x(x+1)
=(x+1)(x^2-x+1+2x)
=(x+1)(x^2+x+1)
d: =(x^2-1)(x^2+1)-2x(x^2-1)
=(x^2-1)(x^2-2x+1)
=(x-1)^2*(x-1)(x+1)
=(x+1)(x-1)^3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-16a^4b^6-24a^5b^5-9a^6b^4\)
\(=-a^4b^4.\left(16b^2+24ab+9a^2\right)\)
\(=-a^4b^4.\left(4b+3a\right)^2\)
\(-16a^4b^6-24a^5b^5-9a^6b^4\)
\(=-a^4b^4\left(9a^2+24ab+16b^2\right)\)
\(=-a^4b^4\left[\left(3a\right)^2+2.3a.4b+\left(4b\right)^2\right]\)
\(=-a^4b^4\left(3a+4b\right)^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(a+b+c\right)^2+\left(a-b+c\right)^2-4b^2\)
\(=2a^2+2b^2+2c^2+2ab+2ac+2bc-2ab-2bc+2ac-4b^2\)
\(=2a^2-2b^2+2c^2+4ac\)
\(=2\left[\left(a^2+2ac+c^2\right)-b^2\right]=2\left[\left(a+c\right)^2-b^2\right]\)
\(=2\left(a+c-b\right)\left(a+b+c\right)\)
=a^4+4*a^2*b^2+4b^4-4*a^2*b^2
=(a^2+2b^2)^2-(2*a*b)^2
=(a^2+2b^2+2*a*b)*(a^2+2b^2-2*a*b)
=a^4+4*a^2*b^2+4b^4-4*a^2*b^2
=(a^2+2b^2)^2-(2*a*b)^2
=(a^2+2b^2+2*a*b)*(a^2+2b^2-2*a*b)