Question

ex 4 testul 1 aaaaaaaaa ms​

Answer 1

x^2-(y-z)^2=42

x^2-(y^2-2yx+x^2)=42

x^2-y^2+2xy-x^2=42

42=-y^2+2yx=

=-1/42 y^2+1/21 yx=

=-1/42y^2+1/21yx

2x+2y-2z=12

2x+2y-24z=

2(x+y-12z)