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  • 2018 December(B05) Math Question 19

    Algebraic & Function Expressions

    - Solve Algebraic Expressions

    Choice C
    $$x=-1, y=2, $$ $$x^{3}-2x^{2}y-4xy^{2}+8$$ $$=(-1)^{3}-2(-1)^{2}\times2-4(-1)\times2^{2}+8$$ $$=-1-2\times2+4\times4+8$$ $$=-1-4+16+8$$ $$=19$$

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