(-5x+2y+z)²
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Step-by-step explanation:
identity used: (-a + b + c )²
= a² + b² + c² - 2ab + 2bc - 2ac
here a = 5x, b = 2y and c = z
therefore (- 5x + 2y + z)²
= (- 5x)²+(2y)²+z²-(2×5x×2y)+(2×2y×z)-(2×5x×z)
=> 25x² + 4y² + z² - 20xy + 4yz - 10xy
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