How to factorize the square of x-9x + 20 Go online, etc

x²-9x+20
=(x-4)(x-5)
cross multiplication
x -4
x -5

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1. Using factorization method to solve the equation: x2-9x + 18 = 0
2. Decompose the square of factor 9x in the range of real number minus 2
3. Factoring in real numbers: 2x ^ 2-8xy + 5Y ^ 2=
4. Factorization 5x (X & sup2; - 2x + 1) + X & sup2; (X-8)
5. Factorization 5 (X & sup2; - Y & sup2;) & sup2; - 1 / 5x & sup2; Y & sup2; Factorization 5 (X & # 178; - Y & # 178;) &# 178; - 1 / 5x & # 178; Y & # 178;
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9. X ^ n + 1-2x ^ n + x ^ n-1, (n is greater than 1 and is a positive integer) factorization
10. The square of factorization factor 2x-8x = the square of 8xy
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12. Factorization of 2x-4xy-5y square in real numbers Ah, I haven't done this kind of question for several years. I forgot how to do it. It's a tragedy
13. Factorization: x2-9a2 + 12a-4; X2Y + 3xy2-x-3y; 1-x2-2xy-y2; 3a2 + 2b-2ab-3a; x2 + Y2 + 2XY + ax + ay; 3x4-48y4 8a3-4a2-2a+1；x2-3xy-28y2；(x2-x)^2-4(x2-x)-12
14. Decomposition factor: x2-2xy-8y2-x-14y-6=______ ．
15. Factorization 1-4x square-4y square + 8xy
16. 1. If the sum of 2x ^ 5A y ^ B + 4 and - 1 / 2x ^ 1-2b y ^ 2a is still a monomial, then B ^ A=_______ .
17. Given that the sum of - 2A ^ 2B ^ x + y and 1 / 3A ^ XB ^ 5 is still monomial, find the value of 1 / 2x ^ 3-1 / 6xy ^ 2 + 1 / 3Y ^ 3
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19. Is there such an integer a that the solution of the system of equations 3x + 4Y = a4x + 3Y = 5 is a pair of non negative numbers? If it exists, find its solution; if it does not exist, give the reason
20. The equations 3x-y = 2,4x + 3Y, XY are () () Sorry ~ 3x-y = 2,4x = 3Y = 1 hey hey