exam Maths Puzzle Numerical Ability

i need help with the process of multipling out polynomials any help would be greatly appreciated!!!!

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exam Other Question

I am stuck on correct answer for:

(x-5)(3x + 4)=0 is:

I am not using a specific book. I am just practicing... Good evening ma'am or sir will you please help on how to solve this problem involving expressions with exponents? Thank you very much.

1). The speed of light is 1.86*10^5 (a sci