Multiply `x^(2)+4y^(2)+z^(2)+2xy+xz-2yz` by (-z+x-2y)

Explanation

To multiply the polynomial \( x^2 + 4y^2 + z^2 + 2xy + xz - 2yz \) by \( -z + x - 2y \), we will use the distributive property (also known as the FOIL method for binomials). Here’s how to do it step by step:

### Step 1: Write down the polynomials
We have:
1. \( P = x^2 + 4y^2 + z^2 + 2xy + xz - 2yz \)
2. \( Q = -z + x - 2y \)

### Step 2: Distribute each term in \( Q \) to every term in \( P \)
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