Question

X²y-x³-9y+9x

9x²-1

(X-y)4-4

9(x-y)²

3x²-6ab+3b²-12c²

X²-25+y²+2xy

Giúp mk với dg cần gấp ngay bây giờ

Answer 1

a)\(x^2y-x^3-9y+9y\)

\(=x^2\left(y-x\right)-9\left(y-x\right)\)

\(=\left(x^2-9\right)\left(y-x\right)\)

\(=\left(x+3\right)\left(x-3\right)\left(y-x\right)\)

\(b,9x^2-1=\left(3x+1\right)\left(3x-1\right)\)

\(c,\left(x-y\right)4-4=\left(x-y-1\right)4\)

Answer 2

\(1,x^2y-x^3-9y+9x=x^2\left(y-x\right)-9\left(y-x\right).\)

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

\(2,9x^2-1=\left(3x\right)^2-1^2=\left(3x+1\right)\left(3x-1\right)\)

\(3,\left(x-y\right)4-4=4\left(x-y-1\right)\)

\(4,\)\(9\left(x-y\right)^2=3^2\left(x-y\right)^2=\left(3x-3y\right)^2\)

\(5,3x^2-6ab+3b^2-12c^2???\)

\(6,x^2-25+y^2+2xy=\left(x+y\right)^2-25\)

\(=\left(x+y-5\right)\left(x+y+5\right)\)