Question

Tìm x:

(x+4)^2+(x-1)^2-2(x-5)(5+x)=21

Answer 1

\(\Leftrightarrow x^2+8x+16+x^2-2x+1-2\left(x^2-25\right)=21\\ \Leftrightarrow2x^2+6x+17-2x^2+50=21\\ \Leftrightarrow6x=-46\Leftrightarrow x=-\dfrac{23}{3}\)