Question

\(x^2-25-3\left(x-5\right)=0\)

Answer 1

đề là cái j????

76868689

Answer 2

x²-25-3x+15=0

x²-25+15-3x=0

x²-10-3x=0

Rồi làm tiếp nhé !

Answer 3

\(x^2-25-3\left(x-5\right)=0\Leftrightarrow\left(x-5\right)\left(x+5\right)-3\left(x-5\right)=0\)

\(\Rightarrow\left(x-5\right)\left(x+5-3\right)=0\Leftrightarrow\left(x-5\right)\left(x+2\right)=0\Leftrightarrow x=5;x=-2\)

Answer 4

 

 

 

A