Hi Brainiac
A) (x)-(2y)-(x)+(5x)+(y)-(2z)
When they ask you to solve this kind of stuff the first thing should come in your mind is " combine the like terms"
What are the like terms ? The like terms are the one that has the same letters.
Anyway let solve this by combining the like terms
(x-x+5x)+(-2y+y) +(-2z)
5x-y-2z
B) As I told you just combine the like terms
(2x)-(-y)+(x)-(3y)
2x+y+x-3y
Combine like terms
(2x+x)+(y-3y)
3x-2y
C) a²- x = a²+b²
-x = a²-a² +b²
-x = b² (multiply both sides by -1 so we can eliminate the negative)
x = -b²
I hope that's help:0
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