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4. From the sum of 2/2 + 3yz,-y2-yz-22 and yz + 2z2, subtract the sum of 31.2and -y t yz + z2 |
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Answer» 2y*y+3yz-y*y-yz-z*z+yz+2z*z-(3y*y-z*z-y*y+yz+z*z) = (y*y+3yz+2z*z)-(2y*y+yz) = y*y+3yz+2z*z-2y*y-yz = 2z*z+2yz-y*y |
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