If $x = 1, y = 2$ and $z = 5$ , find the value of $x y + y z - z x$ .

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Solution

12+25-5*1
2+10-5
12-5
7

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Similar questions

Find the value of $A + B + C$ if :

$A = (7 x y + 5 y z - 3 z x)$
$B = (4 y z + 9 z x - 4 y)$
$C = (- 3 x z + 5 x - 2 x y)$

x - y + z = 5

x^{2} + y^{2} + z^{2} = 49

z x - x y - y z

x + y + z = 6, x y + y z + z x = 11

x^{2} + y^{2} + z^{2} .

x = 2, y = - 1, z = 4

x^{2} + y^{2} + z^{2} - x y - y z - z x

x + y + z = 1

x y + y z + z x = - 1

x y z = - 1

x^{3} + y^{3} + z^{3}

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