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=> {(a - b) + 7c}²
=> {(2a - 2b)² + 2(2a - 2b)(7c) + 49c²}
=> (4a² - 4ab + 4b²) + 28ac - 28bc + 49c²
=> 4a² + 4b² + 49c² - 4ab + 28ac - 28bc
2. (-x + 3y + 4z)²
=> {(-x + 3y)² + 4z}²
=> {(-x + 3y)² + 2(-x +3y)(4z) + 16z²}
=> (x² - 6xy + 9y²) - 8xz + 24yz + 16z²
=> x² + 9y² + 16z² - 6xy - 8xz + 24yz