Question

Subtract 3x – 4y – 7z from the sum of x – 3y + 2z and -4x + 9y – 11z.
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Answer 1

Sum:-

( x -3y+2z)+(-4x+9y-11z)

= x-3y+2z-4x+9y-11z

=-3x +6y-9z

Subtract:-

(-3x+6y-9z) - (3x-4y-7z)

= -3x+6y-9z-3x+4y+7z

=-6x+10y-2z

Answer 2

$(x – 3y + 2z) + (-4x + 9y – 11z) \\ x – 4x – 3y + 9y + 2z – 11z \\ -3x + 6y – 9z\\ \\ (-3x + 6y – 9z) – (3x – 4y – 7z) \\ -3x – 3x + 6y + 4y – 9z + 7z \\ -6x + 10y – 2z$