Question

[võ nhựt trường]

tìm x

x(x-2009)-2010x+2009.2010=0

thank trước nha

Answer 1

[Phan Văn Hiếu]

\(x\left(x-2009\right)-2010x+2009\times2010=0\)

\(x^2-2009x-2010x+2009\times2010=0\)

\(x\left(x-2010\right)-2009\left(x-2010\right)=0\)

\(\left(x-2009\right)\left(x-2010\right)=0\)

nên x - 2009 = 0 

x = 2009

x-2010=0

x=2010