$7 x^{3} + 42 = 1554$ . Find the value for x. [3 MARKS]

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Solution

Concept: 1 Mark
Application: 2 Marks

$7 x^{3} + 42 = 1554$ .

$7 x^{3} = 1554 - 42 = 1512$

$x^{3} = \frac{1512}{7} = 216$

x = cube root of 216 = 6

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