If $x = 3, y = - 2,$ and $z = 5$ , find the value of $5 x y + 4 y z - 3 x z$ ?

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Solution

$5 x y + 4 y z - 3 x z$
$x = 3$ , $y = - 2$ , $z = 5$
$\Rightarrow 5 (3) (- 2) + 4 (- 2) (5) - 3 (3) 5$
$\Rightarrow - 30 - 40 - 45 = - 70 - 45 = - 115$ .

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Similar questions

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

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

When $7 x y + 5 y z - 3 z x$ , $4 y z + 9 z x - 4 y$ and $- 3 x z + 5 x - 2 x y$ are added, we get $5 x y + 9 y z + 3 z x + 5 x - 4 y$ .

x = \frac{\sqrt{5} - \sqrt{3}}{\sqrt{5} + \sqrt{3}}

y = \frac{\sqrt{5} + \sqrt{3}}{\sqrt{5} - \sqrt{3}}

x^{2} + y^{2} - 5 x y

x = 1, y = 2

z = 5

x^{3} - y^{3} - z^{3}

2^{x} \times 3^{y} \times 5^{z} = 2160

3^{x} \times 2^{- y} \times 5^{- z}

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