7. Subtract:
(1) 6x(x - y + z) - 3y(x + y - z) from 2z(-x + y + z)
(ii) 7xy(x2 - 2xy + 3y2) - 8x(xły - 4xy + 7xy2) from 3y(4x²y - 5xy + 8xy-)⁰
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Answer:
(i) -6x² +3y² +2z² -8zx +2zy
Step-by-step explanation:
(i) -2zx +2zy +2z² - [6x² -6xy +6zx -3xy -3y² +3zy]
=>-2zx +2zy +2z² -6x² +6xy -6zx +3xy +3y² -3xy
=>-6x² +3y² +2z² -6zx -2zx +2zy
=>-6x² +3y² +2z² -8zx +2zy
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