Find the value of expression, $x^{3} - 5 x - 2 y - 3 z$ when $x = - 2$ , $y = - 3$ , and $z = 4$ (2 marks)

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Solution

Putting the given values, x = -2, y = -3, and z = 4 in the given expression, we obtain:
$x^{3} - 5 x - 2 y - 3 z$
= $(- 2)^{3}$ - 5(-2) - 2(-3) - 3(4) (1 mark)
= -8 +10 + 6 -12
= -4 (1 mark)

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Similar questions

Find the value of expression, $x^{3} - 5 x - 2 y - 3 z$ when $x = - 2$ , $y = - 3$ , and $z = 4$ .

\frac{x}{2} = \frac{y}{3} = \frac{z}{4}

\frac{x}{3} = \frac{y}{4} = \frac{z}{2} and \frac{x}{4} = \frac{y}{2} = \frac{z}{3}

Find the value of the following expression when $x = 2, y = - 3, z = 1$

$x + y + 3 z$

x = - 1

y = 2

{2 x}^{2} - 3 y + {3 x}^{2} + {5 x}^{2} + 5 x - 7 - 7 x + 2 y

x - 2 y + 3 z = 11

3 x + y - z = 2

5 x + 3 y + 2 z = 3

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