Question

Rút gọn biểu thức sau

 

Answer 1

\(\left(x-5\right)^2+\left(3x-2\right)\left(3x+2\right)\\ =x^2-10x+25+9x^2-4\\ =x^2+9x^2-10x+25-4\\ =x^2-x+21\)

Answer 2

\(\left(x-5\right)^2+\left(3x-2\right)\left(3x+2\right)\)

\(=x^2-10x+25+9x^2-4\)

\(=10x^2-10x+21\)