(2x-3y-z)²+(2x-y+5z)²
pls solve it.
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Answer:
the answer is (4x2 - 8xy + 8xz + 5y2 - 2yz + 13z2)
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(2x-3y-z)²+(2x-y+5z)²
=> (2x)² + (-3y)² + (-z)² +2(-6xy+3yz-2xz) +(2x)²+(-y)²+(5z)² +2(-2xy-5yx+10xz)
=> 4x² + 9y² + z² -12xy + 6yz - 4xz + 4x² + y² +25z² -4xy -10yz + 20xz
=> 8x² + 10y² +26z² - 16xy - 4yz + 16xz
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