Question

( + 2)( − 1) + (−)2 = (2 − 1)( + 2) − 4

Answer 1

Respuesta:

( y + 2 ) ( y - 1 ) + ( - y ) 2 = ( 2 y - 1 ) ( y + 2 ) - 4

$y^{2} - y + 2y-2-2y=2y^{2} +4y - y - 2 - 4$

$y^{2} -y-2=2y^{2} +4y-y-2-4$

$y^{2} -y-2-2y^{2} -3y+6=0$

$-y^{2} -4y+4=0$

$y=-2 (1 \sqrt{2} ), -2(1-\sqrt{2} )$