.If A=x+y+z and B=2x+y-2z... find A+2B.
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Answer:
A=X+y+z
B=2x+y-2z
2b =2×(2x+y-2z)
=4x+2y-4z
A+2b = (X+y+z)+(4x+2y-4z)
=4x+X+y+2y+z-4z
5x+3y-3z
so, A+2b=5x+3y-3z
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