exam Maths Puzzle Numerical Ability

3x^3-24

Since 24 is not a perfect cube I think I factor out the 3 as follows:
3(x^3-8)
Am I on the right track?

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exam Other Question

Sketch one cycle of the curve

y = 2 sin 3x-1

Give the period, amplitude and phase shift Can you please help me solve this problem...instructions...determine which two equations represent perpendicular lines.
(a)y=4/9x-3
(b)y=3x-4/9
(c)y=-1/3x+4/9
(d)y=1/3x-4/9