Factorization: x ^ 2-2 (2a + b) x-ab (A-2) (B + 4)

Factorization: x ^ 2-2 (2a + b) x-ab (A-2) (B + 4)

-Factorization of 9 (2 / 5) * 10 (3 / 5)

-9(2/5)*10(3/5)
=-3(6/5)*5(6/5)
=-3(6/5)*6
=-18(6/5)
=-(108/5)

Factorization
1）x^4-2x²（y+z)²+（y+z）^4
2）y^4-8y²+16
3）（x²-7）²-6（x²-7）+9
4）8x^4-2x²（x+z)²
calculation:
5）（15a^2n-1）²（-16/205 a^2n+1）

Factorization
1）x^4-2x²（y+z)²+（y+z）^4
=（x^2-(y+z)^2)^2
2）y^4-8y²+16
=(y^2-4)^2
3）（x²-7）²-6（x²-7）+9
=(x^2-10)^2
4）8x^4-2x²（x+z)²
=2x^2(4x^2-(x+z)^2)^2=(3x^2+2xz+z^2)2x^2
calculation:
5）（15a^2n-1）²（-16/205 a^2n+1）
=（15a^2n-15a^2n/15a^2n）²（-16/205 a^2n+(16/205 a^2n）/(16/205 a^2n))=14^2*199/205=39004
It seems wrong to calculate the last question by yourself. The main idea is to replace 1 with the number in front