Question

E= (x-3y)2 -4y(2y-x)+8 si sabemos que : x-y=8

Answer 1

x-8=y

(x-3(x-8))2-4(x-8)(2(x-8)-x)+8=0

(x-3x+24)2+(-4x+32)(2x-16-x)+8=0

-4x+48-4$<var>x^{2} </var>$+64x+64x-512+8=0

$<var>-4x^{2} </var>$+124x-456=0

 

X1= 4,26

X2=26,74

 

y=4,26-8=-3,74

y=26,74-8=18,74