What is the value of the expression $2 x^{2} + 3 x y - 4 y^{2}$ $2x^2+ 3xy- 4y^2$ when x=2 and y=-4?

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What is the value of the expression $2 x^{2} + 3 x y - 4 y^{2}$ $2x^2+ 3xy- 4y^2$ when x=2 and y=-4?

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Answer 1 · 2016-12-13T04:23:34

$- 80$ $-80$

Explanation:

Substituting $2$ $2$ for each occurrence of $x$ $x$ in the expression and $- 4$ $-4$ for each occurrence of $y$ $y$ in the expression can calculating gives:

$(2 \cdot 2^{2}) + (3 \cdot 2 \cdot - 4) - (4 \cdot - 4^{2})$ $(2*2^2) + (3*2*-4) - (4*-4^2)$

$(2 \cdot 4) + (6 \cdot - 4) - (4 \cdot 16)$ $(2*4) + (6*-4) - (4*16)$

$8 - 24 - 64$ $8 - 24 - 64$

$- 16 - 64$ $-16 - 64$

$- 80$ $-80$

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What is the value of the expression $2 x^{2} + 3 x y - 4 y^{2}$ $2x^2+ 3xy- 4y^2$ when x=2 and y=-4?

1 Answer

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What is the value of the expression $2 x^{2} + 3 x y - 4 y^{2}$ $2x^2+ 3xy- 4y^2$ when x=2 and y=-4?