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Q. 8. (i) If $z=10,$ find the value of $z^{3}-3(z-10)$

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$\\z^3 - 3( z - 10 ) \\= z^3 - 3z + 30 \\= 10^3 - 3 \times 10 + 30 \\= 1000 - 30 + 30 \\= 1000$

If z = 10 the value of z³ - 3( z - 10 ) = 1000

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