exam Maths Puzzle Numerical Ability

Hi,
I need help with this problem: {{{3x^3-4x=1}}. I'm unsure how to factor it because of the cube. I moved the one to the other side and tried to factor it, but found i couldnt b

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exam Other Question

Calculate

(6x10^5)^2
i dont undersatnd these type of questions rationalize 1/^6-^5 , please right the answers in step by step. thankyou