Question

9. Multiply and verify the result for x = -1, y = -2, z = 2.
(a) xyz(2xy2 – xz2 + yz)
(b) –2xy(y3 – x2+y2+ zy
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Answer 1

Answer:

$1) \: \: xyz(2xy {}^{2} - xz {}^{2} + yz) \\ 2x {}^{2} y {}^{3}z - x {}^{2}yz {}^{3} + x(yz) {}^{2}$

$2( - 1) {}^{2} ( - 2) {}^{3} (2) - ( - 1) {}^{2}( - 2)(2) {}^{3} + ( - 1)( - 2) {}^{2} (2) {}^{2}$

$- 32 + 16 - 16 = - 32$

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