exam Maths Puzzle Numerical Ability

Could someone explain how to solve this problem by multiplying?

8 x a^3+64
___________
3a+12 x 12
Thanks

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exam Other Question

the sqrt of x cubed =27
cubed x squared = 9
is x squared to the 2nd power = x an identitu (true for all nonnegative values of x)?

Please help me to understand. Thanks simplify:
(2x SQRT of 2x)(3 SQRT of 5x)