exam Maths Puzzle Numerical Ability

please help me with this problem it will be very appreciated

Find all zeros of the function
f(x)=-2(3x+2)(8x+1)(9x-5)

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exam Other Question

Find the following product.
(0.3x + 0.2) (0.3x - 0.2) The diamerter of the Mily Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling in 10^16 m/year to travel across the diamerter of the Milky Way?

I am really confused on this one, and need some help.

Thanks