Câu hỏi của Phương Mai

Question

Tìm x , biết : x ( 3x + 2 ) + ( x + 1 )² – ( 2x – 5 )( 2x + 5 ) = – 12

ILoveMath · Accepted Answer

$\Leftrightarrow3x^2+2x+x^2+2x+1-4x^2+25+12=0\ \Leftrightarrow4x+38=0\ \Leftrightarrow x=-\dfrac{19}{2}$

Câu trả lời:

$\Leftrightarrow3x^2+2x+x^2+2x+1-4x^2+25+12=0\ \Leftrightarrow4x+38=0\ \Leftrightarrow x=-\dfrac{19}{2}$

Lấp La Lấp Lánh · Answer

$\Rightarrow3x^2+2x+x^2+2x+1-4x^2+25=-12$

$\Rightarrow4x=-38\Rightarrow x=-\dfrac{19}{2}$

Câu trả lời:

$\Rightarrow3x^2+2x+x^2+2x+1-4x^2+25=-12$

$\Rightarrow4x=-38\Rightarrow x=-\dfrac{19}{2}$