solve (-2x + 5y - 3z)²
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( a + b + c )² = a² + b² + c² + 2ab + 2bc + 2ca
( – 2x + 5y – 3z)²
= (–2)² + 5² + (–3)² + 2 (–2)(5) + 2(5)(–3) + 2(–3)(–2)
= 4 + 25 + 9 – 20 – 30 + 12
= 38 – 20 – 30 + 12
= 50 – 50
= 0
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