Question

if X=a-b+c,Y=a+b+c,Z=a-b-c then find;
g)-X-Y+Z



please answer this question with explaination​

Answer 1

X= a - b + c

=> -X= -(a - b +c) = -a + b - c .........(i)

Y = a + b + c

- Y =- (a + b + c ) = -a - b - c ...........(ii)

Z = a - b - c ...........(iii)

so

-X - Y + Z

= -a + b - c - a - b - c + a - b - c

= -a - b - 3c